patch 9.0.0720: MS-Windows GUI may have pixel dust from antialiasing

Problem:    MS-Windows GUI may have pixel dust from antialiasing.
Solution:   When a character changes also redraw the next one. (issue #8532)

diff --git a/src/screen.c b/src/screen.c
index e5fd4bf0d4c4308c6ed050d2ae4e76e5e583d8a3..d1dd5a40177ad2dde2b4be4874ec49e1c667230a 100644 (file)
--- a/src/screen.c
+++ b/src/screen.c
@@ -475,6 +475,10 @@ screen_line(
 #endif
                                ;
     int                    redraw_next;        // redraw_this for next character
+#ifdef FEAT_GUI_MSWIN
+    int                    changed_this;       // TRUE if character changed
+    int                    changed_next;       // TRUE if next character changed
+#endif
     int                    clear_next = FALSE;
     int                    char_cells;         // 1: normal char
                                        // 2: occupies two display cells
@@ -534,6 +538,9 @@ screen_line(
 #endif
 
     redraw_next = char_needs_redraw(off_from, off_to, endcol - col);
+#ifdef FEAT_GUI_MSWIN
+    changed_next = redraw_next;
+#endif
 
     while (col < endcol)
     {
@@ -547,15 +554,24 @@ screen_line(
                              off_to + char_cells, endcol - col - char_cells);
 
 #ifdef FEAT_GUI
+# ifdef FEAT_GUI_MSWIN
+       changed_this = changed_next;
+       changed_next = redraw_next;
+# endif
        // If the next character was bold, then redraw the current character to
        // remove any pixels that might have spilt over into us.  This only
        // happens in the GUI.
+       // With MS-Windows antialiasing may also cause pixels to spill over
+       // from a previous character, no matter attributes, always redraw if a
+       // character changed.
        if (redraw_next && gui.in_use)
        {
+# ifndef FEAT_GUI_MSWIN
            hl = ScreenAttrs[off_to + char_cells];
            if (hl > HL_ALL)
                hl = syn_attr2attr(hl);
            if (hl & HL_BOLD)
+# endif
                redraw_this = TRUE;
        }
 #endif
@@ -688,6 +704,12 @@ screen_line(
                if (hl & HL_BOLD)
                    redraw_next = TRUE;
            }
+#endif
+#ifdef FEAT_GUI_MSWIN
+           // MS-Windows antialiasing may spill over to the next character,
+           // redraw that one if this one changed, no matter attributes.
+           if (gui.in_use && changed_this)
+               redraw_next = TRUE;
 #endif
            ScreenAttrs[off_to] = ScreenAttrs[off_from];
 

diff --git a/src/version.c b/src/version.c
index fadd4a3d0fff54895b897d9c5a6bcabb716cc2b7..87259de51e79642abf86c541c7687eac6b4d4c1d 100644 (file)
--- a/src/version.c
+++ b/src/version.c
@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    720,
 /**/
     719,
 /**/