[libadwaita/wip/exalm/styles2: 1/2] stylesheet: Add a backdrop style for GtkSearchBar

[Alexander Mikhaylenko <alexm src gnome org>]

commit 5036410b4bc70cd820437f79faff3a5af21ccb7d
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Tue Jun 28 18:06:31 2022 +0400

    stylesheet: Add a backdrop style for GtkSearchBar
    
    Match header bars.

 src/stylesheet/widgets/_toolbars.scss | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/src/stylesheet/widgets/_toolbars.scss b/src/stylesheet/widgets/_toolbars.scss
index 7988c908..7f795997 100644
--- a/src/stylesheet/widgets/_toolbars.scss
+++ b/src/stylesheet/widgets/_toolbars.scss
@@ -147,6 +147,11 @@ searchbar {
     &:backdrop {
       background-color: $headerbar_backdrop_color;
       transition: $backdrop_transition;
+
+      > * {
+        filter: opacity(.5);
+        transition: $backdrop_transition;
+      }
     }
   }