vim-patch:9.0.1331: illegal memory access when using :ball in Visual mode (#22343)

Problem:    Illegal memory access when using :ball in Visual mode.
Solution:   Stop Visual mode when using :ball. (Pavel Mayorov, closes vim/vim#11923)

e1121b1394

Co-authored-by: Pavel Mayorov <pmayorov@cloudlinux.com>

src/nvim/buffer.c

@@ -3600,6 +3600,10 @@ void ex_buffer_all(exarg_T *eap)
     all = true;
   }
 
+  // Stop Visual mode, the cursor and "VIsual" may very well be invalid after
+  // switching to another buffer.
+  reset_VIsual_and_resel();
+
   setpcmark();
 
   // Close superfluous windows (two windows for the same buffer).