test: 'showcmd' with ext_messages and Visual selection (#28393)

Also slightly reorder some code to make comments look less out-of-place.

src/nvim/getchar.c

@@ -64,6 +64,15 @@
 #include "nvim/undo.h"
 #include "nvim/vim_defs.h"
 
+typedef struct {
+  int prev_c;
+  uint8_t buf[MB_MAXBYTES * 3 + 4];
+  size_t buflen;
+  unsigned pending;
+  bool in_special;
+  bool in_mbyte;
+} gotchars_state_T;
+
 /// Index in scriptin
 static int curscript = -1;
 /// Streams to read script from
@@ -84,15 +93,6 @@ static FileDescriptor scriptin[NSCRIPT] = { 0 };
 
 #define MINIMAL_SIZE 20                 // minimal size for b_str
 
-typedef struct {
-  int prev_c;
-  uint8_t buf[MB_MAXBYTES * 3 + 4];
-  size_t buflen;
-  unsigned pending;
-  bool in_special;
-  bool in_mbyte;
-} gotchars_state_T;
-
 static buffheader_T redobuff = { { NULL, { NUL } }, NULL, 0, 0 };
 static buffheader_T old_redobuff = { { NULL, { NUL } }, NULL, 0, 0 };
 static buffheader_T recordbuff = { { NULL, { NUL } }, NULL, 0, 0 };

src/nvim/normal.c

@@ -893,8 +893,8 @@ static bool normal_get_command_count(NormalState *s)
   // Handle a count before a command and compute ca.count0.
   // Note that '0' is a command and not the start of a count, but it's
   // part of a count after other digits.
-  while ((s->c >= '1' && s->c <= '9') || (s->ca.count0 != 0
+  while ((s->c >= '1' && s->c <= '9')
-                                          && (s->c == K_DEL || s->c == K_KDEL || s->c == '0'))) {
+         || (s->ca.count0 != 0 && (s->c == K_DEL || s->c == K_KDEL || s->c == '0'))) {
     if (s->c == K_DEL || s->c == K_KDEL) {
       s->ca.count0 /= 10;
       del_from_showcmd(4);            // delete the digit and ~@%
@@ -2065,9 +2065,6 @@ static void display_showcmd(void)
     return;
   }
   // 'showcmdloc' is "last" or empty
-  if (p_ch == 0 && !ui_has(kUIMessages)) {
-    return;
-  }
 
   if (ui_has(kUIMessages)) {
     MAXSIZE_TEMP_ARRAY(content, 1);
@@ -2081,6 +2078,9 @@ static void display_showcmd(void)
     ui_call_msg_showcmd(content);
     return;
   }
+  if (p_ch == 0) {
+    return;
+  }
 
   msg_grid_validate();
   int showcmd_row = Rows - 1;

test/functional/ui/messages_spec.lua

@@ -685,7 +685,18 @@ describe('ui/ext_messages', function()
     ]],
       ruler = { { '2,1     All' } },
     }
-    feed('d')
+    feed('<c-v>k2l')
+    screen:expect({
+      grid = [[
+        {17:ab}^cde                    |
+        {17:123}45                    |
+        {1:~                        }|*3
+      ]],
+      showmode = { { '-- VISUAL BLOCK --', 5 } },
+      showcmd = { { '2x3' } },
+      ruler = { { '1,3     All' } },
+    })
+    feed('o<esc>d')
     screen:expect {
       grid = [[
       abcde                    |