[libadwaita/wip/exalm/tab-style: 1/2] stylesheet: Use box-shadow for tab bar border

[Alexander Mikhaylenko <alexm src gnome org>]

commit eda3bd666f784b96e166a96e5e106382de1ebaa7
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Apr 8 03:30:16 2022 +0400

    stylesheet: Use box-shadow for tab bar border
    
    Be consistent with header bar and search bar.

 src/stylesheet/widgets/_tab-view.scss | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/stylesheet/widgets/_tab-view.scss b/src/stylesheet/widgets/_tab-view.scss
index a8284196..82677915 100644
--- a/src/stylesheet/widgets/_tab-view.scss
+++ b/src/stylesheet/widgets/_tab-view.scss
@@ -73,7 +73,8 @@ tabbar {
     .box {
       background-color: $headerbar_bg_color;
       color: $headerbar_fg_color;
-      border-bottom: 1px solid $headerbar_border_color;
+      padding-bottom: 1px;
+      box-shadow: inset 0 -1px $headerbar_border_color;
     }
 
     &:backdrop .box {