[libadwaita/wip/exalm/revert-headers: 1/3] Revert "stylesheet: Add back a backdrop state for AdwTabBar"

[Alexander Mikhaylenko <alexm src gnome org>]

commit 97f8aba5dd51ae4254938dd6c3ba5dedd7b862ee
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Thu Jun 24 22:29:22 2021 +0500

    Revert "stylesheet: Add back a backdrop state for AdwTabBar"
    
    This reverts commit 37fc4cb8f15200ad47c3d157450aee16a5493c8f.

 src/stylesheet/widgets/_tab-view.scss | 16 ----------------
 1 file changed, 16 deletions(-)
---
diff --git a/src/stylesheet/widgets/_tab-view.scss b/src/stylesheet/widgets/_tab-view.scss
index d238c978..15d6420a 100644
--- a/src/stylesheet/widgets/_tab-view.scss
+++ b/src/stylesheet/widgets/_tab-view.scss
@@ -27,12 +27,6 @@ tabbar {
     border-bottom: 1px solid $alt_borders_color;
   }
 
-  &:backdrop {
-    filter: brightness(.92);
-    transition: $backdrop_transition;
-    transition-property: filter;
-  }
-
   scrolledwindow.pinned {
     undershoot {
       border: 0 solid $alt_borders_color;
@@ -97,16 +91,6 @@ tabbar {
     &:hover {
       background-color: lighten($tab_bg, 3%);
     }
-
-    &:backdrop {
-      // Apply it to children individually so we don't opacify the background
-      stack,
-      .tab-title,
-      .tab-close-button,
-      .tab-indicator {
-        filter: opacity(.5);
-      }
-    }
   }
 
   .start-action,