fix(input): put modifiers back into typeahead buffer when needed

src/nvim/getchar.c

@@ -973,27 +973,35 @@ int ins_typebuf(char_u *str, int noremap, int offset, bool nottyped, bool silent
  * Uses cmd_silent, KeyTyped and KeyNoremap to restore the flags belonging to
  * the char.
  */
-void ins_char_typebuf(int c)
+void ins_char_typebuf(int c, int modifier)
 {
-  char_u buf[MB_MAXBYTES + 1];
-  if (IS_SPECIAL(c)) {
+  char_u buf[MB_MAXBYTES + 4];
+  int idx = 0;
+  if (modifier != 0) {
     buf[0] = K_SPECIAL;
-    buf[1] = (char_u)K_SECOND(c);
-    buf[2] = (char_u)K_THIRD(c);
+    buf[1] = KS_MODIFIER;
+    buf[2] = (char_u)modifier;
     buf[3] = NUL;
+    idx = 3;
+  }
+  if (IS_SPECIAL(c)) {
+    buf[idx] = K_SPECIAL;
+    buf[idx + 1] = (char_u)K_SECOND(c);
+    buf[idx + 2] = (char_u)K_THIRD(c);
+    buf[idx + 3] = NUL;
   } else {
-    buf[utf_char2bytes(c, buf)] = NUL;
-    char_u *p = buf;
-    while (*p) {
+    char_u *p = buf + idx;
+    int char_len = utf_char2bytes(c, p);
+    // If the character contains K_SPECIAL bytes they need escaping.
+    for (int i = char_len; --i >= 0; p++) {
       if ((uint8_t)(*p) == K_SPECIAL) {
-        memmove(p + 3, p + 1, STRLEN(p + 1) + 1);
+        memmove(p + 3, p + 1, (size_t)i);
         *p++ = K_SPECIAL;
         *p++ = KS_SPECIAL;
-        *p++ = KE_FILLER;
-      } else {
-        p++;
+        *p = KE_FILLER;
       }
     }
+    *p = NUL;
   }
   (void)ins_typebuf(buf, KeyNoremap, 0, !KeyTyped, cmd_silent);
 }
@@ -1433,8 +1441,9 @@ int vgetc(void)
     mouse_row = old_mouse_row;
     mouse_col = old_mouse_col;
   } else {
-    mod_mask = 0x0;
+    mod_mask = 0;
     last_recorded_len = 0;
+
     for (;;) {                 // this is done twice if there are modifiers
       bool did_inc = false;
       if (mod_mask) {           // no mapping after modifier has been read
@@ -1560,8 +1569,8 @@ int vgetc(void)
       if (!no_mapping && KeyTyped && !(State & TERM_FOCUS)
           && (mod_mask == MOD_MASK_ALT || mod_mask == MOD_MASK_META)) {
         mod_mask = 0;
-        ins_char_typebuf(c);
-        ins_char_typebuf(ESC);
+        ins_char_typebuf(c, 0);
+        ins_char_typebuf(ESC, 0);
         continue;
       }
 

src/nvim/globals.h

@@ -127,7 +127,7 @@ typedef off_t off_T;
 
 // When vgetc() is called, it sets mod_mask to the set of modifiers that are
 // held down based on the MOD_MASK_* symbols that are read first.
-EXTERN int mod_mask INIT(= 0x0);  // current key modifiers
+EXTERN int mod_mask INIT(= 0);  // current key modifiers
 
 
 // Cmdline_row is the row where the command line starts, just below the

src/nvim/message.c

@@ -1215,7 +1215,7 @@ void wait_return(int redraw)
     } else if (vim_strchr((char_u *)"\r\n ", c) == NULL && c != Ctrl_C) {
       // Put the character back in the typeahead buffer.  Don't use the
       // stuff buffer, because lmaps wouldn't work.
-      ins_char_typebuf(c);
+      ins_char_typebuf(c, mod_mask);
       do_redraw = true;             // need a redraw even though there is
                                     // typeahead
     }
@@ -3497,7 +3497,7 @@ int do_dialog(int type, char_u *title, char_u *message, char_u *buttons, int dfl
       }
       if (c == ':' && ex_cmd) {
         retval = dfltbutton;
-        ins_char_typebuf(':');
+        ins_char_typebuf(':', 0);
         break;
       }
 

src/nvim/normal.c

@@ -1010,7 +1010,7 @@ static int normal_execute(VimState *state, int key)
     // restart automatically.
     // Insert the typed character in the typeahead buffer, so that it can
     // be mapped in Insert mode.  Required for ":lmap" to work.
-    ins_char_typebuf(s->c);
+    ins_char_typebuf(s->c, mod_mask);
     if (restart_edit != 0) {
       s->c = 'd';
     } else {

src/nvim/terminal.c

@@ -1299,7 +1299,7 @@ static bool send_mouse_event(Terminal *term, int c)
   }
 
 end:
-  ins_char_typebuf(c);
+  ins_char_typebuf(c, mod_mask);
   return true;
 }
 

test/functional/terminal/mouse_spec.lua

@@ -1,7 +1,7 @@
 local helpers = require('test.functional.helpers')(after_each)
 local thelpers = require('test.functional.terminal.helpers')
 local clear, eq, eval = helpers.clear, helpers.eq, helpers.eval
-local feed, nvim = helpers.feed, helpers.nvim
+local feed, nvim, command = helpers.feed, helpers.nvim, helpers.command
 local feed_data = thelpers.feed_data
 
 describe(':terminal mouse', function()
@@ -10,9 +10,9 @@ describe(':terminal mouse', function()
   before_each(function()
     clear()
     nvim('set_option', 'statusline', '==========')
-    nvim('command', 'highlight StatusLine cterm=NONE')
-    nvim('command', 'highlight StatusLineNC cterm=NONE')
-    nvim('command', 'highlight VertSplit cterm=NONE')
+    command('highlight StatusLine cterm=NONE')
+    command('highlight StatusLineNC cterm=NONE')
+    command('highlight VertSplit cterm=NONE')
     screen = thelpers.screen_setup()
     local lines = {}
     for i = 1, 30 do
@@ -38,6 +38,26 @@ describe(':terminal mouse', function()
       eq('nt', eval('mode(1)'))
     end)
 
+    it('will exit focus and trigger Normal mode mapping on mouse click', function()
+      command('let g:got_leftmouse = 0')
+      command('nnoremap <LeftMouse> <Cmd>let g:got_leftmouse = 1<CR>')
+      eq('t', eval('mode(1)'))
+      eq(0, eval('g:got_leftmouse'))
+      feed('<LeftMouse>')
+      eq('nt', eval('mode(1)'))
+      eq(1, eval('g:got_leftmouse'))
+    end)
+
+    it('will exit focus and trigger Normal mode mapping on mouse click with modifier', function()
+      command('let g:got_ctrl_leftmouse = 0')
+      command('nnoremap <C-LeftMouse> <Cmd>let g:got_ctrl_leftmouse = 1<CR>')
+      eq('t', eval('mode(1)'))
+      eq(0, eval('g:got_ctrl_leftmouse'))
+      feed('<C-LeftMouse>')
+      eq('nt', eval('mode(1)'))
+      eq(1, eval('g:got_ctrl_leftmouse'))
+    end)
+
     it('will exit focus on <C-\\> + mouse-scroll', function()
       eq('t', eval('mode(1)'))
       feed('<C-\\>')
@@ -180,7 +200,7 @@ describe(':terminal mouse', function()
 
       it('will forward mouse clicks to the program with the correct even if set nu', function()
         if helpers.pending_win32(pending) then return end
-        nvim('command', 'set number')
+        command('set number')
         -- When the display area such as a number is clicked, it returns to the
         -- normal mode.
         feed('<LeftMouse><3,0>')