vim-patch:9.0.2133: Cannot detect overstrike mode in Cmdline mode (#26263)

Problem:  Cannot detect overstrike mode in Cmdline mode
Solution: Make mode() return "cr" for overstrike

closes: vim/vim#13569

d1c3ef1f47

src/nvim/eval.lua

@@ -7038,7 +7038,9 @@ M.funcs = {
          Rvc	    Virtual Replace mode completion |compl-generic|
          Rvx	    Virtual Replace mode |i_CTRL-X| completion
          c	    Command-line editing
+         cr	    Command-line while in overstrike mode |c_<Insert>|
          cv	    Vim Ex mode |gQ|
+         cvr	    Vim Ex while in overstrike mode |c_<Insert>|
          r	    Hit-enter prompt
          rm	    The -- more -- prompt
          r?	    A |:confirm| query of some sort

src/nvim/ex_getln.c

@@ -1835,8 +1835,10 @@ static int command_line_handle_key(CommandLineState *s)
   case K_INS:
   case K_KINS:
     ccline.overstrike = !ccline.overstrike;
-
     ui_cursor_shape();                // may show different cursor shape
+    may_trigger_modechanged();
+    status_redraw_curbuf();
+    redraw_statuslines();
     return command_line_not_changed(s);
 
   case Ctrl_HAT:

src/nvim/state.c

@@ -8,6 +8,7 @@
 #include "nvim/eval/typval.h"
 #include "nvim/event/defs.h"
 #include "nvim/event/multiqueue.h"
+#include "nvim/ex_getln.h"
 #include "nvim/getchar.h"
 #include "nvim/globals.h"
 #include "nvim/insexpand.h"
@@ -210,6 +211,9 @@ void get_mode(char *buf)
     if (exmode_active) {
       buf[i++] = 'v';
     }
+    if ((State & MODE_CMDLINE) && cmdline_overstrike()) {
+      buf[i++] = 'r';
+    }
   } else if (State & MODE_TERMINAL) {
     buf[i++] = 't';
   } else {