patch 9.0.1826: keytrans() doesn't translate recorded key typed in a GUI

Problem:  keytrans() doesn't translate recorded key typed in a GUI
Solution: Handle CSI like K_SPECIAL, like in mb_unescape()

closes: #12964
closes: #12966

Signed-off-by: Christian Brabandt <[email protected]>
Co-authored-by: zeertzjq <[email protected]>

Author: zeertzjq

src/message.c

@@ -1842,15 +1842,23 @@ str2special(
     }
 
     c = *str;
-    if (c == K_SPECIAL && str[1] != NUL && str[2] != NUL)
+    if ((c == K_SPECIAL
+#ifdef FEAT_GUI
+		|| c == CSI
+#endif
+	) && str[1] != NUL && str[2] != NUL)
     {
 	if (str[1] == KS_MODIFIER)
 	{
 	    modifiers = str[2];
 	    str += 3;
 	    c = *str;
 	}
-	if (c == K_SPECIAL && str[1] != NUL && str[2] != NUL)
+	if ((c == K_SPECIAL
+#ifdef FEAT_GUI
+		    || c == CSI
+#endif
+	    ) && str[1] != NUL && str[2] != NUL)
 	{
 	    c = TO_SPECIAL(str[1], str[2]);
 	    str += 2;

src/testdir/test_gui.vim

@@ -1687,4 +1687,9 @@ func Test_gui_macro_csi()
   iunmap <C-D>t
 endfunc
 
+func Test_gui_csi_keytrans()
+  call assert_equal('<C-L>', keytrans("\x9b\xfc\x04L"))
+  call assert_equal('<C-D>', keytrans("\x9b\xfc\x04D"))
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -699,6 +699,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1826,
 /**/
     1825,
 /**/