patch 9.1.2080: W23/W24 messsage appears on :reg

Problem:  W23/W24 messsage appears on :reg
          (Coacher)
Solution: Silence message when using :reg command
          (Foxe Chen)

fixes:  #19161
closes: #19166

Co-authored-by: h_east <h.east.727@gmail.com>
Signed-off-by: Foxe Chen <chen.foxe@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/globals.h

@@ -2142,3 +2142,6 @@ EXTERN int allow_osc_key INIT(= 0);
 EXTERN redraw_listener_T *redraw_listeners INIT(= NULL);
 EXTERN bool inside_redraw_on_start_cb INIT(= false);
 #endif
+
+// If greater than zero, then silence the W23/W24 warning.
+EXTERN int silence_w23_w24_msg INIT( = 0);

src/message.c

@@ -4207,7 +4207,7 @@ msg_advance(int col)
     void
 msg_warn_missing_clipboard(void)
 {
-    if (!global_busy && !did_warn_clipboard)
+    if (!global_busy && !did_warn_clipboard && silence_w23_w24_msg == 0)
     {
 #ifdef FEAT_CLIPBOARD
 	msg(_("W23: Clipboard register not available, using register 0"));

src/register.c

@@ -2446,6 +2446,7 @@ ex_display(exarg_T *eap)
     int		type;
     string_T	insert;
 
+    silence_w23_w24_msg++;
     if (arg != NULL && *arg == NUL)
 	arg = NULL;
     attr = HL_ATTR(HLF_8);
@@ -2609,6 +2610,7 @@ ex_display(exarg_T *eap)
 #ifdef FEAT_CLIPBOARD_PROVIDER
     dec_clip_provider();
 #endif
+    silence_w23_w24_msg--;
 }
 
 /*

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2080,
 /**/
     2079,
 /**/