adwaita: disable shadows when window is maximized or fullscreen

These shadows cause a significant draw performance drop for maximized
windows. Disabling them increases the chances we can have faster scroll
performance of text.

There is some risk here for systems where they have a dock and you expect
the shadow to draw beneath that dock for transparency reasons.

diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 5588e4fb40aae8e7219bd5298f809462201e66a9..e7c33f8d19297089cb9982320c4fe9012399e700 100644 (file)
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -4100,6 +4100,9 @@ window {
 
       &:backdrop { box-shadow: inset 0 0 0 3px $backdrop_bg_color, inset 0 1px $top_hilight; }
     }
+
+    &.maximized,
+    &.fullscreen { box-shadow: none; }
   }
 
   &.maximized,