[gtk/wip/jimmac/unified-sidebar-styles] Adwaita: unified sidebar styles

[Jakub Steiner <jimmac src gnome org>]

commit 4cd56999a21f473704aa6390c6f7b6479eea691d
Author: Jakub Steiner <jimmac gmail com>
Date:   Fri Nov 20 11:26:13 2020 +0100

    Adwaita: unified sidebar styles
    
    - stacksidebar
    
    Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/3382

 gtk/theme/Adwaita/_common.scss | 20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 09b43d09df..558e78a05e 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -3562,6 +3562,10 @@ filechooserbutton:drop(active) {
 }
 
 stacksidebar {
+  //not a regular list
+  list.separators:not(.horizontal) > row:not(.separator) {
+    border-bottom: none;
+  }
   row {
     padding: 10px 4px;
 
@@ -3572,8 +3576,20 @@ stacksidebar {
 
     &.needs-attention > label {
       @extend %needs_attention;
-
-      background-size: 6px 6px, 0 0;
+       background-size: 6px 6px, 0 0;
+    }
+    &:selected {
+      background-color: $menu_selected_color;
+      border-radius: $menu_radius;
+      color: $fg_color;
+    }
+    &:selected:hover:dir(ltr), &:selected:hover:dir(rtl) {
+      background-color: darken($menu_selected_color,5%);
+    }
+    &:focus:focus-visible {
+      outline-width: 0;
+      background-color: $selected_bg_color;
+      color: $selected_fg_color;
     }
   }
 }