cmdheight=0: fix bugs part2 (#19185)

src/nvim/eval/funcs.c

@@ -2899,6 +2899,11 @@ static void getchar_common(typval_T *argvars, typval_T *rettv)
   no_mapping--;
   allow_keys--;
 
+  if (!ui_has_messages()) {
+    // redraw the screen after getchar()
+    update_screen(CLEAR);
+  }
+
   set_vim_var_nr(VV_MOUSE_WIN, 0);
   set_vim_var_nr(VV_MOUSE_WINID, 0);
   set_vim_var_nr(VV_MOUSE_LNUM, 0);

src/nvim/ex_cmds.c

@@ -3669,7 +3669,7 @@ static int do_sub(exarg_T *eap, proftime_T timeout, long cmdpreview_ns, handle_T
     }
   }
 
-  bool cmdheight0 = p_ch < 1 && !ui_has(kUIMessages);
+  bool cmdheight0 = !ui_has_messages();
   if (cmdheight0) {
     // If cmdheight is 0, cmdheight must be set to 1 when we enter command line.
     set_option_value("ch", 1L, NULL, 0);

src/nvim/ex_getln.c

@@ -689,7 +689,7 @@ static void finish_incsearch_highlighting(int gotesc, incsearch_state_T *s, bool
 /// @param init_ccline  clear ccline first
 static uint8_t *command_line_enter(int firstc, long count, int indent, bool init_ccline)
 {
-  bool cmdheight0 = p_ch < 1 && !ui_has(kUIMessages);
+  bool cmdheight0 = !ui_has_messages();
 
   if (cmdheight0) {
     // If cmdheight is 0, cmdheight must be set to 1 when we enter command line.

src/nvim/message.c

@@ -493,6 +493,7 @@ int smsg(const char *s, ...)
   va_start(arglist, s);
   vim_vsnprintf((char *)IObuff, IOSIZE, s, arglist);
   va_end(arglist);
+
   return msg((char *)IObuff);
 }
 
@@ -1389,7 +1390,7 @@ void msg_start(void)
     need_fileinfo = false;
   }
 
-  bool no_msg_area = !ui_has(kUIMessages) && p_ch < 1;
+  bool no_msg_area = !ui_has_messages();
 
   if (need_clr_eos || (no_msg_area && redrawing_cmdline)) {
     // Halfway an ":echo" command and getting an (error) message: clear
@@ -3112,7 +3113,7 @@ void msg_clr_eos_force(void)
     msg_row = msg_grid_pos;
   }
 
-  if (p_ch > 0) {
+  if (ui_has_messages()) {
     grid_fill(&msg_grid_adj, msg_row, msg_row + 1, msg_startcol, msg_endcol,
               ' ', ' ', HL_ATTR(HLF_MSG));
     grid_fill(&msg_grid_adj, msg_row + 1, Rows, 0, Columns,

src/nvim/normal.c

@@ -2810,7 +2810,7 @@ void pop_showcmd(void)
 
 static void display_showcmd(void)
 {
-  if (p_ch < 1 && !ui_has(kUIMessages)) {
+  if (!ui_has_messages()) {
     return;
   }
 

src/nvim/ops.c

@@ -893,6 +893,7 @@ int do_record(int c)
 {
   char_u *p;
   static int regname;
+  static bool change_cmdheight = false;
   yankreg_T *old_y_previous;
   int retval;
 
@@ -906,6 +907,13 @@ int do_record(int c)
       showmode();
       regname = c;
       retval = OK;
+      if (!ui_has_messages()) {
+        // Enable macro indicator temporary
+        set_option_value("ch", 1L, NULL, 0);
+        update_screen(VALID);
+
+        change_cmdheight = true;
+      }
       apply_autocmds(EVENT_RECORDINGENTER, NULL, NULL, false, curbuf);
     }
   } else {  // stop recording
@@ -928,6 +936,15 @@ int do_record(int c)
     (void)tv_dict_add_str(dict, S_LEN("regname"), buf);
     tv_dict_set_keys_readonly(dict);
 
+    if (change_cmdheight) {
+      // Restore cmdheight
+      set_option_value("ch", 0L, NULL, 0);
+
+      redraw_all_later(CLEAR);
+
+      change_cmdheight = false;
+    }
+
     // Get the recorded key hits.  K_SPECIAL will be escaped, this
     // needs to be removed again to put it in a register.  exec_reg then
     // adds the escaping back later.
@@ -2789,7 +2806,7 @@ static void op_yank_reg(oparg_T *oap, bool message, yankreg_T *reg, bool append)
     xfree(reg->y_array);
   }
 
-  if (message && (p_ch > 0 || ui_has(kUIMessages))) {  // Display message about yank?
+  if (message) {  // Display message about yank?
     if (yank_type == kMTCharWise && yanklines == 1) {
       yanklines = 0;
     }

src/nvim/screen.c

@@ -6143,10 +6143,6 @@ void unshowmode(bool force)
 // Clear the mode message.
 void clearmode(void)
 {
-  if (p_ch <= 0 && !ui_has(kUIMessages)) {
-    return;
-  }
-
   const int save_msg_row = msg_row;
   const int save_msg_col = msg_col;
 
@@ -6164,10 +6160,6 @@ void clearmode(void)
 
 static void recording_mode(int attr)
 {
-  if (p_ch <= 0 && !ui_has(kUIMessages)) {
-    return;
-  }
-
   msg_puts_attr(_("recording"), attr);
   if (!shortmess(SHM_RECORDING)) {
     char s[4];
@@ -6472,8 +6464,7 @@ int redrawing(void)
  */
 int messaging(void)
 {
-  return !(p_lz && char_avail() && !KeyTyped)
-         && (p_ch > 0 || ui_has(kUIMessages));
+  return !(p_lz && char_avail() && !KeyTyped) && ui_has_messages();
 }
 
 /// Show current status info in ruler and various other places
@@ -6587,7 +6578,7 @@ static void win_redr_ruler(win_T *wp, bool always)
       off = 0;
     }
 
-    if (!part_of_status && p_ch < 1 && !ui_has(kUIMessages)) {
+    if (!part_of_status && !ui_has_messages()) {
       return;
     }
 

src/nvim/ui.c

@@ -612,6 +612,12 @@ bool ui_has(UIExtension ext)
   return ui_ext[ext];
 }
 
+/// Returns true if the UI has messages area.
+bool ui_has_messages(void)
+{
+  return p_ch > 0 || ui_has(kUIMessages);
+}
+
 Array ui_array(void)
 {
   Array all_uis = ARRAY_DICT_INIT;

src/nvim/window.c

@@ -5877,7 +5877,7 @@ void win_setminheight(void)
   // loop until there is a 'winminheight' that is possible
   while (p_wmh > 0) {
     const int room = Rows - (int)p_ch;
-    const int needed = min_rows() - 1;  // 1 was added for the cmdline
+    const int needed = min_rows();
     if (room >= needed) {
       break;
     }
@@ -6830,7 +6830,9 @@ int min_rows(void)
     }
   }
   total += tabline_height() + global_stl_height();
-  total += 1;           // count the room for the command line
+  if (p_ch > 0) {
+    total += 1;           // count the room for the command line
+  }
   return total;
 }
 

test/functional/ui/cmdline_spec.lua

@@ -1103,7 +1103,7 @@ describe('cmdheight=0', function()
       ~                        |
       ~                        |
       ~                        |
-      ~                        |
+      recording @q             |
     ]], showmode={}}
     feed('q')
     screen:expect{grid=[[