# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1645384503 -3600
# Node ID 9b01fea87065b8b2a899a86e4f9f885fb7ff963c
# Parent  db4fb9a86f7935c1103b22db03dcad2cfe1b7aab
patch 8.2.4427: getchar() may return modifiers if no character is available

Commit: https://github.com/vim/vim/commit/ad6c45f62558e03d3e3a927b3fe4dbaf30a36bef
Author: zeertzjq <zeertzjq@outlook.com>
Date:   Sun Feb 20 19:05:10 2022 +0000

    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 https://github.com/vim/vim/issues/9806)

diff --git a/src/getchar.c b/src/getchar.c
--- a/src/getchar.c
+++ b/src/getchar.c
@@ -2103,7 +2103,7 @@ getchar_common(typval_T *argvars, typval
     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
--- 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
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4427,
+/**/
     4426,
 /**/
     4425,