[gtk/nana-4/gtk-sidebar-style-fixes: 6/8] Adwaita: Unify sidebar background-color

[Jakub Steiner <jimmac src gnome org>]

commit 61dcb685b2f7fe37aa02cce480e686dd2fd6c7ce
Author: nana-4 <hnmaigo gmail com>
Date:   Sun Nov 22 14:22:39 2020 +0900

    Adwaita: Unify sidebar background-color
    
    The sidebar item style is already unified. The sidebar background-color
    should be unified as well.
    
    See https://gitlab.gnome.org/GNOME/gtk/-/issues/3382

 gtk/theme/Adwaita/_common.scss | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 7374453392..ad3b06788d 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -187,7 +187,6 @@ label {
 window.assistant {
   .sidebar {
     padding: $menu-margin;
-    background-color: $base_color;
     border-top: 1px solid $borders_color;
   }
 
@@ -3540,7 +3539,6 @@ filechooserbutton:drop(active) {
  * Sidebar *
  ***********/
 .sidebar {
-  border-style: none;
   background-color: mix($bg_color, $base_color, 50%);
 
   &:not(separator) {
@@ -3560,6 +3558,7 @@ filechooserbutton:drop(active) {
     }
   }
 
+  listview.view,
   list { background-color: transparent; }
 
   paned & { &.left, &.right, &.left:dir(rtl), &:dir(rtl), &:dir(ltr), & { border-style: none; }}