[libadwaita/wip/exalm/tab-style] stylesheet: Restore tab bar needs attention style

[Alexander Mikhaylenko <alexm src gnome org>]

commit bfe06556876d8dd9bee88184c12696ac6242fbbb
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sat Apr 9 19:17:53 2022 +0400

    stylesheet: Restore tab bar needs attention style
    
    Somehow this wasn't included into the main commit.

 src/stylesheet/widgets/_tab-view.scss | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/stylesheet/widgets/_tab-view.scss b/src/stylesheet/widgets/_tab-view.scss
index 82677915..e4beff08 100644
--- a/src/stylesheet/widgets/_tab-view.scss
+++ b/src/stylesheet/widgets/_tab-view.scss
@@ -20,6 +20,13 @@ tabbar {
         opacity: 0;
       }
     }
+
+    > revealer > indicator {
+      min-width: 2px;
+      border-radius: 2px;
+      margin: 9px 6px;
+      background: if($contrast == 'high', $accent_color, gtkalpha($accent_color, 0.5));
+    }
   }
 
   tab {