From: zeertzjq <zeertzjq@outlook.com>
Date: Sun, 20 Feb 2022 19:05:10 +0000 (+0000)
Subject: patch 8.2.4427: getchar() may return modifiers if no character is available
X-Git-Tag: v8.2.4427
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ad6c45f62558e03d3e3a927b3fe4dbaf30a36bef;p=vim

patch 8.2.4427: getchar() may return modifiers if no character is available

Problem:    getchar() may return modifiers if no character is available.
Solution:   Do not process modifiers when there is no character. (closes #9806)
---

diff --git a/src/getchar.c b/src/getchar.c
index 2068ca43c..fcc9b9ac4 100644
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -2103,7 +2103,7 @@ getchar_common(typval_T *argvars, typval_T *rettv)
     set_vim_var_nr(VV_MOUSE_COL, 0);
 
     rettv->vval.v_number = n;
-    if (IS_SPECIAL(n) || mod_mask != 0)
+    if (n != 0 && (IS_SPECIAL(n) || mod_mask != 0))
     {
 	char_u		temp[10];   // modifier: 3, mbyte-char: 6, NUL: 1
 	int		i = 0;
diff --git a/src/testdir/test_functions.vim b/src/testdir/test_functions.vim
index e2820db9c..e22a0c6ba 100644
--- a/src/testdir/test_functions.vim
+++ b/src/testdir/test_functions.vim
@@ -1818,6 +1818,10 @@ func Test_getchar()
   call assert_equal('', getcharstr(0))
   call assert_equal('', getcharstr(1))
 
+  call feedkeys("\<M-F2>", '')
+  call assert_equal("\<M-F2>", getchar(0))
+  call assert_equal(0, getchar(0))
+
   call setline(1, 'xxxx')
   call test_setmouse(1, 3)
   let v:mouse_win = 9
diff --git a/src/version.c b/src/version.c
index 6c5ca2bdd..c5f5c22f9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4427,
 /**/
     4426,
 /**/