patch 9.1.0064: No Wayland support

Problem:  No Wayland support
Solution: Add Wayland UI support
          (lilydjwg)

closes: #9639

Signed-off-by: lilydjwg <lilydjwg@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/gui.h b/src/gui.h
index 1882000..c677ba1 100644
--- a/src/gui.h
+++ b/src/gui.h
@@ -259,6 +259,7 @@
     int		scrollbar_height;   // Height of horizontal scrollbar
     int		left_sbar_x;	    // Calculated x coord for left scrollbar
     int		right_sbar_x;	    // Calculated x coord for right scrollbar
+    int         force_redraw;       // Force a redraw even e.g. not resized
 
 #ifdef FEAT_MENU
 # ifndef FEAT_GUI_GTK