vim-patch:9.0.0234: cannot make difference between :normal end and argument char (#19879)

Problem:    Cannot make difference between the end of :normal and a character
            in its argument.
Solution:   Add the "typebuf_was_empty" flag. (closes vim/vim#10950)
8d69637133

src/nvim/getchar.c

@@ -2400,7 +2400,8 @@ static int vgetorpeek(bool advance)
   vgetc_busy++;
 
   if (advance) {
-    KeyStuffed = FALSE;
+    KeyStuffed = false;
+    typebuf_was_empty = false;
   }
 
   init_typebuf();
@@ -2626,6 +2627,11 @@ static int vgetorpeek(bool advance)
           }
           tc = c;
 
+          // set a flag to indicate this wasn't a normal char
+          if (advance) {
+            typebuf_was_empty = true;
+          }
+
           // return 0 in normal_check()
           if (pending_exmode_active) {
             exmode_active = true;

src/nvim/globals.h

@@ -705,6 +705,10 @@ EXTERN int recoverymode INIT(= false);      // Set to true for "-r" option
 // typeahead buffer
 EXTERN typebuf_T typebuf INIT(= { NULL, NULL, 0, 0, 0, 0, 0, 0, 0 });
 
+/// Flag used to indicate that vgetorpeek() returned a char like Esc when the
+/// :normal argument was exhausted.
+EXTERN bool typebuf_was_empty INIT(= false);
+
 EXTERN int ex_normal_busy INIT(= 0);     // recursiveness of ex_normal()
 EXTERN int ex_normal_lock INIT(= 0);     // forbid use of ex_normal()
 EXTERN int ignore_script INIT(= false);  // ignore script input

src/nvim/normal.c

@@ -6943,10 +6943,10 @@ static void nv_esc(cmdarg_T *cap)
       got_int = false;          // don't stop executing autocommands et al.
       return;
     }
-  } else if (cmdwin_type != 0 && ex_normal_busy) {
+  } else if (cmdwin_type != 0 && ex_normal_busy && typebuf_was_empty) {
     // When :normal runs out of characters while in the command line window
-    // vgetorpeek() will return ESC.  Exit the cmdline window to break the
+    // vgetorpeek() will repeatedly return ESC.  Exit the cmdline window to
-    // loop.
+    // break the loop.
     cmdwin_result = K_IGNORE;
     return;
   }