vim-patch:9.0.0318: clearing screen causes flicker (#19993)

Problem:    Clearing screen causes flicker.
Solution:   Do not clear but redraw in more cases.  Add () to "wait_return".
13608d851a

Only 2 lines of actual code change.

src/nvim/if_cscope.c

@@ -2035,7 +2035,7 @@ static int cs_show(exarg_T *eap)
     }
   }
 
-  wait_return(true);
+  wait_return(false);
   return CSCOPE_SUCCESS;
 }