[gtk/wip/jimmac/clipped-menu-shadows] Adwaita: avoid clipping menu shadows

[Jakub Steiner <jimmac src gnome org>]

commit b3dba1dca66d380d1cfafbe92b36d7854b3f4244
Author: Jakub Steiner <jimmac gmail com>
Date:   Fri Nov 20 13:04:04 2020 +0100

    Adwaita: avoid clipping menu shadows
    
    Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/1987

 gtk/theme/Adwaita/_common.scss | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 2b71335c95..934f70f0c5 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1862,6 +1862,7 @@ $_menu-padding: 12px; //inner menuitem padding
 
 popover.menu {
   padding: 0;
+  margin: 0 3px 5px 3px; //alocate space for dropshadow. #1987
 
   box.inline-buttons {
     padding: 0 $_menu-padding;