patch 9.0.0813: Kitty terminal is not recognized

Problem:    Kitty terminal is not recognized.
Solution:   Recognize Kitty by the termresponse and then do not set
            seenModifyOtherKeys, since Kitty doesn't support that.
            (issue #11413)

runtime/doc/builtin.txt

@@ -9670,6 +9670,7 @@ terminalprops()						*terminalprops()*
 		   cursor_blink_mode	whether sending |t_RC| works  **
 		   underline_rgb	whether |t_8u| works **
 		   mouse		mouse type supported
+		   kitty		whether Kitty terminal was detected
 
 		** value 'u' for unknown, 'y' for yes, 'n' for no
 

src/term.c

@@ -1350,8 +1350,10 @@ typedef struct {
 #define TPR_UNDERLINE_RGB	    2
 // mouse support - TPR_MOUSE_XTERM, TPR_MOUSE_XTERM2 or TPR_MOUSE_SGR
 #define TPR_MOUSE		    3
+// term response indicates kitty
+#define TPR_KITTY		    4
 // table size
-#define TPR_COUNT		    4
+#define TPR_COUNT		    5
 
 static termprop_T term_props[TPR_COUNT];
 
@@ -1373,6 +1375,8 @@ init_term_props(int all)
     term_props[TPR_UNDERLINE_RGB].tpr_set_by_termresponse = TRUE;
     term_props[TPR_MOUSE].tpr_name = "mouse";
     term_props[TPR_MOUSE].tpr_set_by_termresponse = TRUE;
+    term_props[TPR_KITTY].tpr_name = "kitty";
+    term_props[TPR_KITTY].tpr_set_by_termresponse = FALSE;
 
     for (i = 0; i < TPR_COUNT; ++i)
 	if (all || term_props[i].tpr_set_by_termresponse)
@@ -4715,6 +4719,13 @@ handle_version_response(int first, int *arg, int argc, char_u *tp)
 	// else if (version == 115 && arg[0] == 0 && arg[2] == 0)
 	//     term_props[TPR_UNDERLINE_RGB].tpr_status = TPR_YES;
 
+	// Kitty sends 1;400{version};{secondary-version}
+	if (arg[0] == 1 && arg[1] >= 4000 && arg[1] <= 4009)
+	{
+	    term_props[TPR_KITTY].tpr_status = TPR_YES;
+	    term_props[TPR_KITTY].tpr_set_by_termresponse = TRUE;
+	}
+
 	// GNU screen sends 83;30600;0, 83;40500;0, etc.
 	// 30600/40500 is a version number of GNU screen. DA2 support is added
 	// on 3.6.  DCS string has a special meaning to GNU screen, but xterm
@@ -4848,7 +4859,11 @@ handle_key_with_modifier(
     int	    modifiers;
     char_u  string[MAX_KEY_CODE_LEN + 1];
 
-    seenModifyOtherKeys = TRUE;
+    // Do not set seenModifyOtherKeys for kitty, it does send some sequences
+    // like this but does not have the modifyOtherKeys feature.
+    if (term_props[TPR_KITTY].tpr_status != TPR_YES)
+	seenModifyOtherKeys = TRUE;
+
     if (trail == 'u')
 	key = arg[0];
     else

src/testdir/test_termcodes.vim

@@ -1647,7 +1647,8 @@ func Test_xx01_term_style_response()
         \ cursor_style: 'u',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'u',
-        \ mouse: 's'
+        \ mouse: 's',
+        \ kitty: 'u',
         \ }, terminalprops())
 
   set t_RV=
@@ -1681,7 +1682,8 @@ func Test_xx02_iTerm2_response()
         \ cursor_style: 'n',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'u',
-        \ mouse: 's'
+        \ mouse: 's',
+        \ kitty: 'u',
         \ }, terminalprops())
 
   set t_RV=
@@ -1700,7 +1702,8 @@ func Run_libvterm_konsole_response(code)
         \ cursor_style: 'n',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'u',
-        \ mouse: 's'
+        \ mouse: 's',
+        \ kitty: 'u',
         \ }, terminalprops())
 endfunc
 
@@ -1742,7 +1745,8 @@ func Test_xx04_Mac_Terminal_response()
         \ cursor_style: 'n',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'y',
-        \ mouse: 's'
+        \ mouse: 's',
+        \ kitty: 'u',
         \ }, terminalprops())
   call assert_equal("\<Esc>[58;2;%lu;%lu;%lum", &t_8u)
 
@@ -1772,7 +1776,8 @@ func Test_xx05_mintty_response()
         \ cursor_style: 'n',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'y',
-        \ mouse: 's'
+        \ mouse: 's',
+        \ kitty: 'u',
         \ }, terminalprops())
 
   set t_RV=
@@ -1807,7 +1812,8 @@ func Test_xx06_screen_response()
         \ cursor_style: 'n',
         \ cursor_blink_mode: 'n',
         \ underline_rgb: 'y',
-        \ mouse: 's'
+        \ mouse: 's',
+        \ kitty: 'u',
         \ }, terminalprops())
 
   set t_RV=
@@ -1831,7 +1837,8 @@ func Do_check_t_8u_set_reset(set_by_user)
         \ cursor_style: 'u',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'u',
-        \ mouse: 's'
+        \ mouse: 's',
+        \ kitty: 'u',
         \ }, terminalprops())
   call assert_equal(a:set_by_user ? default_value : '', &t_8u)
 endfunc
@@ -1867,7 +1874,8 @@ func Test_xx07_xterm_response()
         \ cursor_style: 'n',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'y',
-        \ mouse: 'u'
+        \ mouse: 'u',
+        \ kitty: 'u',
         \ }, terminalprops())
 
   " xterm >= 95 < 277 "xterm2"
@@ -1882,7 +1890,8 @@ func Test_xx07_xterm_response()
         \ cursor_style: 'n',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'u',
-        \ mouse: '2'
+        \ mouse: '2',
+        \ kitty: 'u',
         \ }, terminalprops())
 
   " xterm >= 277: "sgr"
@@ -1897,7 +1906,8 @@ func Test_xx07_xterm_response()
         \ cursor_style: 'n',
         \ cursor_blink_mode: 'u',
         \ underline_rgb: 'u',
-        \ mouse: 's'
+        \ mouse: 's',
+        \ kitty: 'u',
         \ }, terminalprops())
 
   " xterm >= 279: "sgr" and cursor_style not reset; also check t_8u reset,
@@ -1909,6 +1919,30 @@ func Test_xx07_xterm_response()
   call test_override('term_props', 0)
 endfunc
 
+func Test_xx08_kitty_response()
+  " Termresponse is only parsed when t_RV is not empty.
+  set t_RV=x
+  call test_override('term_props', 1)
+
+  set ttymouse=xterm
+  call test_option_not_set('ttymouse')
+  let seq = "\<Esc>[>1;4001;12c"
+  call feedkeys(seq, 'Lx!')
+  call assert_equal(seq, v:termresponse)
+  call assert_equal('sgr', &ttymouse)
+
+  call assert_equal(#{
+        \ cursor_style: 'u',
+        \ cursor_blink_mode: 'u',
+        \ underline_rgb: 'y',
+        \ mouse: 's',
+        \ kitty: 'y',
+        \ }, terminalprops())
+
+  set t_RV=
+  call test_override('term_props', 0)
+endfunc
+
 func Test_focus_events()
   let save_term = &term
   let save_ttymouse = &ttymouse

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    813,
 /**/
     812,
 /**/