From dcb9d4e6128831f8c9c88e79e5631430482f86bd Mon Sep 17 00:00:00 2001
From: Roger Nesbitt <roger@seriousorange.com>
Date: Thu, 24 Feb 2022 05:42:25 +1300
Subject: [PATCH] Use "none" instead of "transparent" when painting in SVG

The SVG 1.1 spec, which SVGs generated by gvrender_core_svg.c are
labeled as, does not have the color "transparent" available which is
causing issues with SVG 1.1 parsers.

When specifying paint in the fill or stroke attributes, use "none"
instead of "transparent".  When specifying a gradient color that has
zero opacity, use that color at zero opacity instead of "transparent".
When specifying a gradient with the graphviz transparent color, use
a zero-opacity black as this is how SVG interprets "transparent" in
gradients in SVG 2.0.
---
 CHANGELOG.md                                  |   2 +
 plugin/core/gvrender_core_svg.c               | 116 +++++++-----
 tests/linux.x86/grdangles_dot.svg             |   2 +-
 tests/linux.x86/grdcluster_dot.svg            |   8 +-
 tests/linux.x86/grdcolors_dot.svg             |   2 +-
 tests/linux.x86/grdfillcolor_dot.svg          | 166 +++++++++---------
 tests/linux.x86/grdlinear_angle_dot.svg       | 166 +++++++++---------
 tests/linux.x86/grdlinear_dot.svg             | 166 +++++++++---------
 tests/linux.x86/grdlinear_node_dot.svg        |   2 +-
 tests/linux.x86/grdradial_angle_dot.svg       | 166 +++++++++---------
 tests/linux.x86/grdradial_dot.svg             | 166 +++++++++---------
 tests/linux.x86/grdradial_node_dot.svg        |   2 +-
 tests/linux.x86/grdshapes_dot.svg             |   2 +-
 tests/linux.x86/html2_dot.svg                 |  22 +--
 tests/linux.x86/url_dot.svg                   |   4 +-
 tests/nshare/html2_dot.svg                    |  22 +--
 tests/nshare/url_dot.svg                      |   4 +-
 .../shapes/reference/Mcircle.svg              |   2 +-
 .../shapes/reference/Mdiamond.svg             |   2 +-
 .../shapes/reference/Msquare.svg              |   2 +-
 .../shapes/reference/assembly.svg             |   2 +-
 .../regression_tests/shapes/reference/box.svg |   2 +-
 .../shapes/reference/box3d.svg                |   2 +-
 .../regression_tests/shapes/reference/cds.svg |   2 +-
 .../shapes/reference/circle.svg               |   2 +-
 .../shapes/reference/component.svg            |   2 +-
 .../shapes/reference/cylinder.svg             |   2 +-
 .../shapes/reference/diamond.svg              |   2 +-
 .../shapes/reference/doublecircle.svg         |   2 +-
 .../shapes/reference/doubleoctagon.svg        |   2 +-
 .../regression_tests/shapes/reference/egg.svg |   2 +-
 .../shapes/reference/ellipse.svg              |   2 +-
 .../shapes/reference/fivepoverhang.svg        |   2 +-
 .../shapes/reference/folder.svg               |   2 +-
 .../shapes/reference/hexagon.svg              |   2 +-
 .../shapes/reference/house.svg                |   2 +-
 .../shapes/reference/insulator.svg            |   2 +-
 .../shapes/reference/invhouse.svg             |   2 +-
 .../shapes/reference/invtrapezium.svg         |   2 +-
 .../shapes/reference/invtriangle.svg          |   2 +-
 .../shapes/reference/larrow.svg               |   2 +-
 .../shapes/reference/lpromoter.svg            |   2 +-
 .../shapes/reference/none.svg                 |   2 +-
 .../shapes/reference/note.svg                 |   2 +-
 .../shapes/reference/noverhang.svg            |   2 +-
 .../shapes/reference/octagon.svg              |   2 +-
 .../shapes/reference/oval.svg                 |   2 +-
 .../shapes/reference/parallelogram.svg        |   2 +-
 .../shapes/reference/pentagon.svg             |   2 +-
 .../shapes/reference/plain.svg                |   2 +-
 .../shapes/reference/plaintext.svg            |   2 +-
 .../shapes/reference/point.svg                |   2 +-
 .../shapes/reference/polygon.svg              |   2 +-
 .../shapes/reference/primersite.svg           |   2 +-
 .../shapes/reference/promoter.svg             |   2 +-
 .../shapes/reference/proteasesite.svg         |   2 +-
 .../shapes/reference/proteinstab.svg          |   2 +-
 .../shapes/reference/rarrow.svg               |   2 +-
 .../shapes/reference/rect.svg                 |   2 +-
 .../shapes/reference/rectangle.svg            |   2 +-
 .../shapes/reference/restrictionsite.svg      |   2 +-
 .../shapes/reference/ribosite.svg             |   2 +-
 .../shapes/reference/rnastab.svg              |   2 +-
 .../shapes/reference/rpromoter.svg            |   2 +-
 .../shapes/reference/septagon.svg             |   2 +-
 .../shapes/reference/signature.svg            |   2 +-
 .../shapes/reference/square.svg               |   2 +-
 .../shapes/reference/star.svg                 |   2 +-
 .../regression_tests/shapes/reference/tab.svg |   2 +-
 .../shapes/reference/terminator.svg           |   2 +-
 .../shapes/reference/threepoverhang.svg       |   2 +-
 .../shapes/reference/trapezium.svg            |   2 +-
 .../shapes/reference/triangle.svg             |   2 +-
 .../shapes/reference/tripleoctagon.svg        |   2 +-
 .../shapes/reference/underline.svg            |   4 +-
 .../regression_tests/shapes/reference/utr.svg |   2 +-
 tests/usershape.svg                           |   2 +-
 77 files changed, 582 insertions(+), 558 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 134809f67..e6fad0051 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Memory leak in dot when using clusters
 - Memory leak in patchwork when using clusters
 - Subgraph layout and rendering
+- Generated SVG files no longer use `transparent` paint or color as this keyword
+  does not exist in SVG 1.1, and instead use `none` or a zero-opacity color.
 
 ## [5.0.0] – 2022-07-07
 
diff --git a/plugin/core/gvrender_core_svg.c b/plugin/core/gvrender_core_svg.c
index 6c1a65223..4ebd205d8 100644
--- a/plugin/core/gvrender_core_svg.c
+++ b/plugin/core/gvrender_core_svg.c
@@ -50,6 +50,10 @@ static char *sdasharray = "5,2";
 /* SVG dot array */
 static char *sdotarray = "1,5";
 
+static char *transparent = "transparent";
+static char *none = "none";
+static char *black = "black";
+
 static void svg_bzptarray(GVJ_t * job, pointf * A, int n)
 {
     int i;
@@ -103,15 +107,21 @@ static void svg_print_id_class(GVJ_t * job, char* id, char* idx, char* kind, voi
     gvputc(job, '"');
 }
 
-static void svg_print_color(GVJ_t * job, gvcolor_t color)
+/* svg_print_paint assumes the caller will set the opacity if the alpha channel
+ * is greater than 0 and less than 255
+ */
+static void svg_print_paint(GVJ_t * job, gvcolor_t color)
 {
     switch (color.type) {
     case COLOR_STRING:
-	gvputs(job, color.u.string);
+	if (!strcmp(color.u.string, transparent))
+	    gvputs(job, none);
+	else
+	    gvputs(job, color.u.string);
 	break;
     case RGBA_BYTE:
 	if (color.u.rgba[3] == 0)	/* transparent */
-	    gvputs(job, "transparent");
+	    gvputs(job, none);
 	else
 	    gvprintf(job, "#%02x%02x%02x",
 		     color.u.rgba[0], color.u.rgba[1], color.u.rgba[2]);
@@ -121,6 +131,31 @@ static void svg_print_color(GVJ_t * job, gvcolor_t color)
     }
 }
 
+/* svg_print_gradient_color assumes the caller will set the opacity if the
+ * alpha channel is less than 255.
+ *
+ * "transparent" in SVG 2 gradients is considered to be black with 0 opacity,
+ * so for compatibility with SVG 1.1 output we use black when the color string
+ * is transparent and assume the caller will also check and set opacity 0.
+ */
+static void svg_print_gradient_color(GVJ_t * job, gvcolor_t color)
+{
+    switch (color.type) {
+    case COLOR_STRING:
+	if (!strcmp(color.u.string, transparent))
+	    gvputs(job, black);
+	else
+	    gvputs(job, color.u.string);
+	break;
+    case RGBA_BYTE:
+	gvprintf(job, "#%02x%02x%02x",
+		 color.u.rgba[0], color.u.rgba[1], color.u.rgba[2]);
+	break;
+    default:
+	assert(0);		/* internal error */
+    }
+}
+
 static void svg_grstyle(GVJ_t * job, int filled, int gid)
 {
     obj_state_t *obj = job->obj;
@@ -131,7 +166,7 @@ static void svg_grstyle(GVJ_t * job, int filled, int gid)
     } else if (filled == RGRADIENT) {
 	gvprintf(job, "url(#r_%d)", gid);
     } else if (filled) {
-	svg_print_color(job, obj->fillcolor);
+	svg_print_paint(job, obj->fillcolor);
 	if (obj->fillcolor.type == RGBA_BYTE
 	    && obj->fillcolor.u.rgba[3] > 0
 	    && obj->fillcolor.u.rgba[3] < 255)
@@ -141,7 +176,7 @@ static void svg_grstyle(GVJ_t * job, int filled, int gid)
 	gvputs(job, "none");
     }
     gvputs(job, "\" stroke=\"");
-    svg_print_color(job, obj->pencolor);
+    svg_print_paint(job, obj->pencolor);
     if (obj->penwidth != PENWIDTH_NORMAL) {
 	gvputs(job, "\" stroke-width=\"");
         gvprintdouble(job, obj->penwidth);
@@ -484,6 +519,25 @@ static void svg_textspan(GVJ_t * job, pointf p, textspan_t * span)
     gvputs(job, "</text>\n");
 }
 
+static void svg_print_stop(GVJ_t * job, double offset, gvcolor_t color)
+{
+    if (offset == 0.0)
+	gvputs(job, "<stop offset=\"0\" style=\"stop-color:");
+    else if (offset == 1.0)
+	gvputs(job, "<stop offset=\"1\" style=\"stop-color:");
+    else
+	gvprintf(job, "<stop offset=\"%.03f\" style=\"stop-color:", offset);
+    svg_print_gradient_color(job, color);
+    gvputs(job, ";stop-opacity:");
+    if (color.type == RGBA_BYTE && color.u.rgba[3] < 255)
+	gvprintf(job, "%f", ((float) color.u.rgba[3] / 255.0));
+    else if (color.type == COLOR_STRING && !strcmp(color.u.string, transparent))
+	gvputs(job, "0");
+    else
+	gvputs(job, "1.");
+    gvputs(job, ";\"/>\n");
+}
+
 /* svg_gradstyle
  * Outputs the SVG statements that define the gradient pattern
  */
@@ -509,30 +563,11 @@ static int svg_gradstyle(GVJ_t * job, pointf * A, int n)
     gvputs(job, "\" y2=\"");
     gvprintdouble(job, G[1].y);
     gvputs(job, "\" >\n");
-    if (obj->gradient_frac > 0)
-	gvprintf(job, "<stop offset=\"%.03f\" style=\"stop-color:", obj->gradient_frac - 0.001);
-    else
-	gvputs(job, "<stop offset=\"0\" style=\"stop-color:");
-    svg_print_color(job, obj->fillcolor);
-    gvputs(job, ";stop-opacity:");
-    if (obj->fillcolor.type == RGBA_BYTE && obj->fillcolor.u.rgba[3] > 0
-	&& obj->fillcolor.u.rgba[3] < 255)
-	gvprintf(job, "%f", ((float) obj->fillcolor.u.rgba[3] / 255.0));
-    else
-	gvputs(job, "1.");
-    gvputs(job, ";\"/>\n");
-    if (obj->gradient_frac > 0)
-	gvprintf(job, "<stop offset=\"%.03f\" style=\"stop-color:", obj->gradient_frac);
-    else
-	gvputs(job, "<stop offset=\"1\" style=\"stop-color:");
-    svg_print_color(job, obj->stopcolor);
-    gvputs(job, ";stop-opacity:");
-    if (obj->stopcolor.type == RGBA_BYTE && obj->stopcolor.u.rgba[3] > 0
-	&& obj->stopcolor.u.rgba[3] < 255)
-	gvprintf(job, "%f", ((float) obj->stopcolor.u.rgba[3] / 255.0));
-    else
-	gvputs(job, "1.");
-    gvputs(job, ";\"/>\n</linearGradient>\n</defs>\n");
+
+    svg_print_stop(job, obj->gradient_frac > 0 ? obj->gradient_frac - 0.001 : 0.0, obj->fillcolor);
+    svg_print_stop(job, obj->gradient_frac > 0 ? obj->gradient_frac : 1.0, obj->stopcolor);
+
+    gvputs(job, "</linearGradient>\n</defs>\n");
     return id;
 }
 
@@ -557,24 +592,11 @@ static int svg_rgradstyle(GVJ_t * job)
 	     "<defs>\n<radialGradient id=\"r_%d\" cx=\"50%%\" cy=\"50%%\" r=\"75%%\" "
 	     "fx=\"%.0f%%\" fy=\"%.0f%%\">\n",
 	     id, ifx, ify);
-    gvputs(job, "<stop offset=\"0\" style=\"stop-color:");
-    svg_print_color(job, obj->fillcolor);
-    gvputs(job, ";stop-opacity:");
-    if (obj->fillcolor.type == RGBA_BYTE && obj->fillcolor.u.rgba[3] > 0
-	&& obj->fillcolor.u.rgba[3] < 255)
-	gvprintf(job, "%f", ((float) obj->fillcolor.u.rgba[3] / 255.0));
-    else
-	gvputs(job, "1.");
-    gvputs(job, ";\"/>\n"
-                "<stop offset=\"1\" style=\"stop-color:");
-    svg_print_color(job, obj->stopcolor);
-    gvputs(job, ";stop-opacity:");
-    if (obj->stopcolor.type == RGBA_BYTE && obj->stopcolor.u.rgba[3] > 0
-	&& obj->stopcolor.u.rgba[3] < 255)
-	gvprintf(job, "%f", ((float) obj->stopcolor.u.rgba[3] / 255.0));
-    else
-	gvputs(job, "1.");
-    gvputs(job, ";\"/>\n</radialGradient>\n</defs>\n");
+
+    svg_print_stop(job, 0.0, obj->fillcolor);
+    svg_print_stop(job, 1.0, obj->stopcolor);
+
+    gvputs(job, "</radialGradient>\n</defs>\n");
     return id;
 }
 
diff --git a/tests/linux.x86/grdangles_dot.svg b/tests/linux.x86/grdangles_dot.svg
index f93afbb64..6ada3c6b8 100644
--- a/tests/linux.x86/grdangles_dot.svg
+++ b/tests/linux.x86/grdangles_dot.svg
@@ -8,7 +8,7 @@
  viewBox="0.00 0.00 880.00 259.49" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 255.4867)">
 <title>G</title>
-<polygon fill="#0000ff" stroke="transparent" points="-4,4 -4,-255.4867 876,-255.4867 876,4 -4,4"/>
+<polygon fill="#0000ff" stroke="none" points="-4,4 -4,-255.4867 876,-255.4867 876,4 -4,4"/>
 <g id="clust1" class="cluster">
 <title>cluster_1</title>
 <polygon fill="#0000ff" stroke="#000000" points="49,-134.293 49,-243.4867 823,-243.4867 823,-134.293 49,-134.293"/>
diff --git a/tests/linux.x86/grdcluster_dot.svg b/tests/linux.x86/grdcluster_dot.svg
index ae540cdcb..8b9869226 100644
--- a/tests/linux.x86/grdcluster_dot.svg
+++ b/tests/linux.x86/grdcluster_dot.svg
@@ -8,7 +8,7 @@
  viewBox="0.00 0.00 172.00 364.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 360)">
 <title>G</title>
-<polygon fill="#ffffff" stroke="transparent" points="-4,4 -4,-360 168,-360 168,4 -4,4"/>
+<polygon fill="#ffffff" stroke="none" points="-4,4 -4,-360 168,-360 168,4 -4,4"/>
 <g id="clust1" class="cluster">
 <title>cluster0</title>
 <defs>
@@ -27,7 +27,7 @@
 <stop offset="1" style="stop-color:#ff0000;stop-opacity:1.;"/>
 </linearGradient>
 </defs>
-<polygon fill="url(#l_1)" stroke="transparent" points="8,-224 8,-276 78,-276 78,-224 8,-224"/>
+<polygon fill="url(#l_1)" stroke="none" points="8,-224 8,-276 78,-276 78,-224 8,-224"/>
 </g>
 <g id="clust3" class="cluster">
 <title>cluster2</title>
@@ -35,7 +35,7 @@
 </g>
 <g id="clust4" class="cluster">
 <title>cluster3</title>
-<path fill="#ff0000" stroke="transparent" d="M20,-80C20,-80 66,-80 66,-80 72,-80 78,-86 78,-92 78,-92 78,-120 78,-120 78,-126 72,-132 66,-132 66,-132 20,-132 20,-132 14,-132 8,-126 8,-120 8,-120 8,-92 8,-92 8,-86 14,-80 20,-80"/>
+<path fill="#ff0000" stroke="none" d="M20,-80C20,-80 66,-80 66,-80 72,-80 78,-86 78,-92 78,-92 78,-120 78,-120 78,-126 72,-132 66,-132 66,-132 20,-132 20,-132 14,-132 8,-126 8,-120 8,-120 8,-92 8,-92 8,-86 14,-80 20,-80"/>
 </g>
 <g id="clust5" class="cluster">
 <title>cluster4</title>
@@ -45,7 +45,7 @@
 <stop offset="1" style="stop-color:#0000ff;stop-opacity:1.;"/>
 </linearGradient>
 </defs>
-<polygon fill="url(#l_2)" stroke="transparent" points="8,-8 8,-60 78,-60 78,-8 8,-8"/>
+<polygon fill="url(#l_2)" stroke="none" points="8,-8 8,-60 78,-60 78,-8 8,-8"/>
 </g>
 <g id="clust6" class="cluster">
 <title>cluster5</title>
diff --git a/tests/linux.x86/grdcolors_dot.svg b/tests/linux.x86/grdcolors_dot.svg
index 344adaa56..a5815f5c2 100644
--- a/tests/linux.x86/grdcolors_dot.svg
+++ b/tests/linux.x86/grdcolors_dot.svg
@@ -8,7 +8,7 @@
  viewBox="0.00 0.00 510.00 392.19" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 388.1915)">
 <title>G</title>
-<polygon fill="#0000ff" stroke="transparent" points="-4,4 -4,-388.1915 506,-388.1915 506,4 -4,4"/>
+<polygon fill="#0000ff" stroke="none" points="-4,4 -4,-388.1915 506,-388.1915 506,4 -4,4"/>
 <g id="clust1" class="cluster">
 <title>cluster_1</title>
 <polygon fill="#0000ff" stroke="#000000" points="49,-291.1915 49,-376.1915 489,-376.1915 489,-291.1915 49,-291.1915"/>
diff --git a/tests/linux.x86/grdfillcolor_dot.svg b/tests/linux.x86/grdfillcolor_dot.svg
index 0fce6c078..ba15d7946 100644
--- a/tests/linux.x86/grdfillcolor_dot.svg
+++ b/tests/linux.x86/grdfillcolor_dot.svg
@@ -14,7 +14,7 @@
 <stop offset="1" style="stop-color:#ffc0cb;stop-opacity:1.;"/>
 </linearGradient>
 </defs>
-<polygon fill="url(#l_0)" stroke="transparent" points="-4,4 -4,-738.8641 738,-738.8641 738,4 -4,4"/>
+<polygon fill="url(#l_0)" stroke="none" points="-4,4 -4,-738.8641 738,-738.8641 738,4 -4,4"/>
 <g id="clust1" class="cluster">
 <title>cluster1</title>
 <defs>
@@ -41,8 +41,8 @@
 <stop offset="1" style="stop-color:#ee82ee;stop-opacity:1.;"/>
 </linearGradient>
 </defs>
-<path fill="url(#l_3)" stroke="transparent" d="M144,-127.9321C144,-127.9321 590,-127.9321 590,-127.9321 596,-127.9321 602,-133.9321 602,-139.9321 602,-139.9321 602,-594.9321 602,-594.9321 602,-600.9321 596,-606.9321 590,-606.9321 590,-606.9321 144,-606.9321 144,-606.9321 138,-606.9321 132,-600.9321 132,-594.9321 132,-594.9321 132,-139.9321 132,-139.9321 132,-133.9321 138,-127.9321 144,-127.9321"/>
-<polygon fill="#ffff00" stroke="transparent" points="147,-550.4321 147,-591.4321 187,-591.4321 187,-550.4321 147,-550.4321"/>
+<path fill="url(#l_3)" stroke="none" d="M144,-127.9321C144,-127.9321 590,-127.9321 590,-127.9321 596,-127.9321 602,-133.9321 602,-139.9321 602,-139.9321 602,-594.9321 602,-594.9321 602,-600.9321 596,-606.9321 590,-606.9321 590,-606.9321 144,-606.9321 144,-606.9321 138,-606.9321 132,-600.9321 132,-594.9321 132,-594.9321 132,-139.9321 132,-139.9321 132,-133.9321 138,-127.9321 144,-127.9321"/>
+<polygon fill="#ffff00" stroke="none" points="147,-550.4321 147,-591.4321 187,-591.4321 187,-550.4321 147,-550.4321"/>
 <polygon fill="none" stroke="#000000" stroke-width="3" points="148.5,-551.9321 148.5,-589.9321 185.5,-589.9321 185.5,-551.9321 148.5,-551.9321"/>
 <text text-anchor="start" x="160" y="-567.2321" font-family="Times,serif" font-size="14.00" fill="#000000">00</text>
 <defs>
@@ -51,10 +51,10 @@
 <stop offset="1" style="stop-color:#00ff00;stop-opacity:1.;"/>
 </linearGradient>
 </defs>
-<polygon fill="url(#l_4)" stroke="transparent" stroke-width="3" points="197,-550.4321 197,-591.4321 237,-591.4321 237,-550.4321 197,-550.4321"/>
+<polygon fill="url(#l_4)" stroke="none" stroke-width="3" points="197,-550.4321 197,-591.4321 237,-591.4321 237,-550.4321 197,-550.4321"/>
 <polygon fill="none" stroke="#000000" stroke-width="3" points="198.5,-551.9321 198.5,-589.9321 235.5,-589.9321 235.5,-551.9321 198.5,-551.9321"/>
 <text text-anchor="start" x="210" y="-567.2321" font-family="Times,serif" font-size="14.00" fill="#000000">01</text>
-<polygon fill="#00ff00" stroke="transparent" stroke-width="3" points="247,-550.4321 247,-591.4321 287,-591.4321 287,-550.4321 247,-550.4321"/>
+<polygon fill="#00ff00" stroke="none" stroke-width="3" points="247,-550.4321 247,-591.4321 287,-591.4321 287,-550.4321 247,-550.4321"/>
 <polygon fill="none" stroke="#000000" stroke-width="3" points="248.5,-551.9321 248.5,-589.9321 285.5,-589.9321 285.5,-551.9321 248.5,-551.9321"/>
 <text text-anchor="start" x="260" y="-567.2321" font-family="Times,serif" font-size="14.00" fill="#000000">02</text>
 <defs>
@@ -63,10 +63,10 @@
 <stop offset="1" style="stop-color:#0000ff;stop-opacity:1.;"/>
 </linearGradient>
 </defs>
-<polygon fill="url(#l_5)" stroke="transparent" stroke-width="3" points="297,-550.4321 297,-591.4321 337,-591.4321 337,-550.4321 297,-550.4321"/>
+<polygon fill="url(#l_5)" stroke="none" stroke-width="3" points="297,-550.4321 297,-591.4321 337,-591.4321 337,-550.4321 297,-550.4321"/>
 <polygon fill="none" stroke="#000000" stroke-width="3" points="298.5,-551.9321 298.5,-589.9321 335.5,-589.9321 335.5,-551.9321 298.5,-551.9321"/>
 <text text-anchor="start" x="310" y="-567.2321" font-family="Times,serif" font-size="14.00" fill="#000000">03</text>
-<polygon fill="#0000ff" stroke="transparent" stroke-width="3" points="347,-550.4321 347,-591.4321 387,-591.4321 387,-550.4321 347,-550.4321"/>
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diff --git a/tests/linux.x86/grdlinear_node_dot.svg b/tests/linux.x86/grdlinear_node_dot.svg
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diff --git a/tests/linux.x86/grdradial_angle_dot.svg b/tests/linux.x86/grdradial_angle_dot.svg
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index 8883104db..135e39517 100644
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diff --git a/tests/linux.x86/url_dot.svg b/tests/linux.x86/url_dot.svg
index 262e0c479..c58ca78fa 100644
--- a/tests/linux.x86/url_dot.svg
+++ b/tests/linux.x86/url_dot.svg
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diff --git a/tests/nshare/html2_dot.svg b/tests/nshare/html2_dot.svg
index a6492859b..e4ace0b9f 100644
--- a/tests/nshare/html2_dot.svg
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@@ -54,7 +54,7 @@
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@@ -96,13 +96,13 @@
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diff --git a/tests/nshare/url_dot.svg b/tests/nshare/url_dot.svg
index 1ecdfcba3..2a1b0d193 100644
--- a/tests/nshare/url_dot.svg
+++ b/tests/nshare/url_dot.svg
@@ -10,7 +10,7 @@
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diff --git a/tests/regression_tests/shapes/reference/Mcircle.svg b/tests/regression_tests/shapes/reference/Mcircle.svg
index 5f9b6bfe9..cef8ebe79 100644
--- a/tests/regression_tests/shapes/reference/Mcircle.svg
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diff --git a/tests/regression_tests/shapes/reference/Mdiamond.svg b/tests/regression_tests/shapes/reference/Mdiamond.svg
index 6da7dbc39..d3b150cc6 100644
--- a/tests/regression_tests/shapes/reference/Mdiamond.svg
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diff --git a/tests/regression_tests/shapes/reference/Msquare.svg b/tests/regression_tests/shapes/reference/Msquare.svg
index d2fd30a6b..f660b11dc 100644
--- a/tests/regression_tests/shapes/reference/Msquare.svg
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diff --git a/tests/regression_tests/shapes/reference/assembly.svg b/tests/regression_tests/shapes/reference/assembly.svg
index a23e633b8..d0b4d9eff 100644
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/box.svg b/tests/regression_tests/shapes/reference/box.svg
index 002a3a51f..843642753 100644
--- a/tests/regression_tests/shapes/reference/box.svg
+++ b/tests/regression_tests/shapes/reference/box.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/box3d.svg b/tests/regression_tests/shapes/reference/box3d.svg
index 3652fb726..d2a52bd99 100644
--- a/tests/regression_tests/shapes/reference/box3d.svg
+++ b/tests/regression_tests/shapes/reference/box3d.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/cds.svg b/tests/regression_tests/shapes/reference/cds.svg
index 20e584cb7..4d925f075 100644
--- a/tests/regression_tests/shapes/reference/cds.svg
+++ b/tests/regression_tests/shapes/reference/cds.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/circle.svg b/tests/regression_tests/shapes/reference/circle.svg
index 21369922c..0c43887e5 100644
--- a/tests/regression_tests/shapes/reference/circle.svg
+++ b/tests/regression_tests/shapes/reference/circle.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/component.svg b/tests/regression_tests/shapes/reference/component.svg
index cec35196c..0ed245c7d 100644
--- a/tests/regression_tests/shapes/reference/component.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/cylinder.svg b/tests/regression_tests/shapes/reference/cylinder.svg
index 4aba3025e..41203becb 100644
--- a/tests/regression_tests/shapes/reference/cylinder.svg
+++ b/tests/regression_tests/shapes/reference/cylinder.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/diamond.svg b/tests/regression_tests/shapes/reference/diamond.svg
index 62b8cef10..41fc072db 100644
--- a/tests/regression_tests/shapes/reference/diamond.svg
+++ b/tests/regression_tests/shapes/reference/diamond.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/doublecircle.svg b/tests/regression_tests/shapes/reference/doublecircle.svg
index 104ede0ce..17d5d1a0d 100644
--- a/tests/regression_tests/shapes/reference/doublecircle.svg
+++ b/tests/regression_tests/shapes/reference/doublecircle.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/doubleoctagon.svg b/tests/regression_tests/shapes/reference/doubleoctagon.svg
index 7d27e70c0..1d3a77295 100644
--- a/tests/regression_tests/shapes/reference/doubleoctagon.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/egg.svg b/tests/regression_tests/shapes/reference/egg.svg
index 50a475944..489e76143 100644
--- a/tests/regression_tests/shapes/reference/egg.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/ellipse.svg b/tests/regression_tests/shapes/reference/ellipse.svg
index 294b051f7..a57dc24d3 100644
--- a/tests/regression_tests/shapes/reference/ellipse.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/fivepoverhang.svg b/tests/regression_tests/shapes/reference/fivepoverhang.svg
index 6575004b8..dd805bb53 100644
--- a/tests/regression_tests/shapes/reference/fivepoverhang.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/folder.svg b/tests/regression_tests/shapes/reference/folder.svg
index c4360378f..af9aff332 100644
--- a/tests/regression_tests/shapes/reference/folder.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/hexagon.svg b/tests/regression_tests/shapes/reference/hexagon.svg
index abc088e47..2b3cc52c8 100644
--- a/tests/regression_tests/shapes/reference/hexagon.svg
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diff --git a/tests/regression_tests/shapes/reference/house.svg b/tests/regression_tests/shapes/reference/house.svg
index 556826f55..7d0351cef 100644
--- a/tests/regression_tests/shapes/reference/house.svg
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diff --git a/tests/regression_tests/shapes/reference/insulator.svg b/tests/regression_tests/shapes/reference/insulator.svg
index 18f8929c4..c2476ad21 100644
--- a/tests/regression_tests/shapes/reference/insulator.svg
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diff --git a/tests/regression_tests/shapes/reference/invhouse.svg b/tests/regression_tests/shapes/reference/invhouse.svg
index 8f71a512e..679c19259 100644
--- a/tests/regression_tests/shapes/reference/invhouse.svg
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index 4a9b77016..02ae34b11 100644
--- a/tests/regression_tests/shapes/reference/invtrapezium.svg
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diff --git a/tests/regression_tests/shapes/reference/invtriangle.svg b/tests/regression_tests/shapes/reference/invtriangle.svg
index f5df2adf4..3179abf43 100644
--- a/tests/regression_tests/shapes/reference/invtriangle.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/larrow.svg b/tests/regression_tests/shapes/reference/larrow.svg
index 5b8aa7528..c92c36648 100644
--- a/tests/regression_tests/shapes/reference/larrow.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/lpromoter.svg b/tests/regression_tests/shapes/reference/lpromoter.svg
index 033242c55..74ceef44b 100644
--- a/tests/regression_tests/shapes/reference/lpromoter.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/none.svg b/tests/regression_tests/shapes/reference/none.svg
index 7716caad4..36cb4fdf3 100644
--- a/tests/regression_tests/shapes/reference/none.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/note.svg b/tests/regression_tests/shapes/reference/note.svg
index c82c8ac18..1fbd3bcbf 100644
--- a/tests/regression_tests/shapes/reference/note.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/noverhang.svg b/tests/regression_tests/shapes/reference/noverhang.svg
index af5018188..5976c315f 100644
--- a/tests/regression_tests/shapes/reference/noverhang.svg
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diff --git a/tests/regression_tests/shapes/reference/octagon.svg b/tests/regression_tests/shapes/reference/octagon.svg
index f5ccaf8a5..f70026c81 100644
--- a/tests/regression_tests/shapes/reference/octagon.svg
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@@ -8,7 +8,7 @@
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index 294b051f7..a57dc24d3 100644
--- a/tests/regression_tests/shapes/reference/oval.svg
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@@ -8,7 +8,7 @@
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index 2f46cbff1..c9b356e5d 100644
--- a/tests/regression_tests/shapes/reference/parallelogram.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/pentagon.svg b/tests/regression_tests/shapes/reference/pentagon.svg
index 5fa8c7846..66e7f02d7 100644
--- a/tests/regression_tests/shapes/reference/pentagon.svg
+++ b/tests/regression_tests/shapes/reference/pentagon.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/plain.svg b/tests/regression_tests/shapes/reference/plain.svg
index 60e4c282f..c639e1e3d 100644
--- a/tests/regression_tests/shapes/reference/plain.svg
+++ b/tests/regression_tests/shapes/reference/plain.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/plaintext.svg b/tests/regression_tests/shapes/reference/plaintext.svg
index 7716caad4..36cb4fdf3 100644
--- a/tests/regression_tests/shapes/reference/plaintext.svg
+++ b/tests/regression_tests/shapes/reference/plaintext.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/point.svg b/tests/regression_tests/shapes/reference/point.svg
index 1e07f5878..ed1986827 100644
--- a/tests/regression_tests/shapes/reference/point.svg
+++ b/tests/regression_tests/shapes/reference/point.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/polygon.svg b/tests/regression_tests/shapes/reference/polygon.svg
index 002a3a51f..843642753 100644
--- a/tests/regression_tests/shapes/reference/polygon.svg
+++ b/tests/regression_tests/shapes/reference/polygon.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/primersite.svg b/tests/regression_tests/shapes/reference/primersite.svg
index 51e1793da..b4c7d269e 100644
--- a/tests/regression_tests/shapes/reference/primersite.svg
+++ b/tests/regression_tests/shapes/reference/primersite.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/promoter.svg b/tests/regression_tests/shapes/reference/promoter.svg
index 0c74c7b94..34b3808a3 100644
--- a/tests/regression_tests/shapes/reference/promoter.svg
+++ b/tests/regression_tests/shapes/reference/promoter.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/proteasesite.svg b/tests/regression_tests/shapes/reference/proteasesite.svg
index 16121f281..962dc5f5a 100644
--- a/tests/regression_tests/shapes/reference/proteasesite.svg
+++ b/tests/regression_tests/shapes/reference/proteasesite.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/proteinstab.svg b/tests/regression_tests/shapes/reference/proteinstab.svg
index fe4e1dd31..b439585df 100644
--- a/tests/regression_tests/shapes/reference/proteinstab.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/rarrow.svg b/tests/regression_tests/shapes/reference/rarrow.svg
index ed2869d8f..e998ed4df 100644
--- a/tests/regression_tests/shapes/reference/rarrow.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/rect.svg b/tests/regression_tests/shapes/reference/rect.svg
index 002a3a51f..843642753 100644
--- a/tests/regression_tests/shapes/reference/rect.svg
+++ b/tests/regression_tests/shapes/reference/rect.svg
@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/rectangle.svg b/tests/regression_tests/shapes/reference/rectangle.svg
index 002a3a51f..843642753 100644
--- a/tests/regression_tests/shapes/reference/rectangle.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/restrictionsite.svg b/tests/regression_tests/shapes/reference/restrictionsite.svg
index 4c4120c55..dee97613c 100644
--- a/tests/regression_tests/shapes/reference/restrictionsite.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/ribosite.svg b/tests/regression_tests/shapes/reference/ribosite.svg
index 1524c38ea..325853484 100644
--- a/tests/regression_tests/shapes/reference/ribosite.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/rnastab.svg b/tests/regression_tests/shapes/reference/rnastab.svg
index 961cac453..0d04f0a31 100644
--- a/tests/regression_tests/shapes/reference/rnastab.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/rpromoter.svg b/tests/regression_tests/shapes/reference/rpromoter.svg
index 22eaa10d2..11fd975d6 100644
--- a/tests/regression_tests/shapes/reference/rpromoter.svg
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diff --git a/tests/regression_tests/shapes/reference/septagon.svg b/tests/regression_tests/shapes/reference/septagon.svg
index 623dd022f..61a545cd6 100644
--- a/tests/regression_tests/shapes/reference/septagon.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/signature.svg b/tests/regression_tests/shapes/reference/signature.svg
index d7b839617..089c20b2f 100644
--- a/tests/regression_tests/shapes/reference/signature.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/square.svg b/tests/regression_tests/shapes/reference/square.svg
index 289bb1ee3..b37dee8b0 100644
--- a/tests/regression_tests/shapes/reference/square.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/star.svg b/tests/regression_tests/shapes/reference/star.svg
index af0fd1e4c..969bea805 100644
--- a/tests/regression_tests/shapes/reference/star.svg
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diff --git a/tests/regression_tests/shapes/reference/tab.svg b/tests/regression_tests/shapes/reference/tab.svg
index 4adbe70c0..92cf02494 100644
--- a/tests/regression_tests/shapes/reference/tab.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/terminator.svg b/tests/regression_tests/shapes/reference/terminator.svg
index af577b0bf..92657a1d6 100644
--- a/tests/regression_tests/shapes/reference/terminator.svg
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@@ -8,7 +8,7 @@
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index 1685a0f7e..c3787ef1e 100644
--- a/tests/regression_tests/shapes/reference/threepoverhang.svg
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@@ -8,7 +8,7 @@
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diff --git a/tests/regression_tests/shapes/reference/trapezium.svg b/tests/regression_tests/shapes/reference/trapezium.svg
index fe472665b..edb93acc7 100644
--- a/tests/regression_tests/shapes/reference/trapezium.svg
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diff --git a/tests/regression_tests/shapes/reference/triangle.svg b/tests/regression_tests/shapes/reference/triangle.svg
index 0fb2fec0f..6da877ea9 100644
--- a/tests/regression_tests/shapes/reference/triangle.svg
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@@ -8,7 +8,7 @@
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index e69a38f63..09e4dbe10 100644
--- a/tests/regression_tests/shapes/reference/tripleoctagon.svg
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diff --git a/tests/regression_tests/shapes/reference/underline.svg b/tests/regression_tests/shapes/reference/underline.svg
index aa4cfcdf0..d437311a5 100644
--- a/tests/regression_tests/shapes/reference/underline.svg
+++ b/tests/regression_tests/shapes/reference/underline.svg
@@ -8,11 +8,11 @@
  viewBox="0.00 0.00 62.00 44.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 40)">
 <title>G</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-40 58,-40 58,4 -4,4"/>
+<polygon fill="white" stroke="none" points="-4,4 -4,-40 58,-40 58,4 -4,4"/>
 <!-- a -->
 <g id="node1" class="node">
 <title>a</title>
-<polygon fill="none" stroke="transparent" points="54,-36 0,-36 0,0 54,0 54,-36"/>
+<polygon fill="none" stroke="none" points="54,-36 0,-36 0,0 54,0 54,-36"/>
 <polyline fill="none" stroke="black" points="0,0 54,0 "/>
 </g>
 </g>
diff --git a/tests/regression_tests/shapes/reference/utr.svg b/tests/regression_tests/shapes/reference/utr.svg
index 7758ed6ad..d00489d61 100644
--- a/tests/regression_tests/shapes/reference/utr.svg
+++ b/tests/regression_tests/shapes/reference/utr.svg
@@ -8,7 +8,7 @@
  viewBox="0.00 0.00 62.00 44.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 40)">
 <title>G</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-40 58,-40 58,4 -4,4"/>
+<polygon fill="white" stroke="none" points="-4,4 -4,-40 58,-40 58,4 -4,4"/>
 <!-- a -->
 <g id="node1" class="node">
 <title>a</title>
diff --git a/tests/usershape.svg b/tests/usershape.svg
index 0fb2fec0f..6da877ea9 100644
--- a/tests/usershape.svg
+++ b/tests/usershape.svg
@@ -8,7 +8,7 @@
  viewBox="0.00 0.00 62.00 44.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
 <g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 40)">
 <title>G</title>
-<polygon fill="white" stroke="transparent" points="-4,4 -4,-40 58,-40 58,4 -4,4"/>
+<polygon fill="white" stroke="none" points="-4,4 -4,-40 58,-40 58,4 -4,4"/>
 <!-- a -->
 <g id="node1" class="node">
 <title>a</title>
-- 
2.40.0