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/option.c

@@ -1553,7 +1553,7 @@ skip:
       // make sure all characters are printable
       trans_characters((char *)IObuff, IOSIZE);
 
-      no_wait_return++;         // wait_return done later
+      no_wait_return++;         // wait_return() done later
       emsg((char *)IObuff);     // show error highlighted
       no_wait_return--;