GTK3: improve design of sidebar row

src/themes/Kali/sass/gtk3/_applications.scss

@@ -16,19 +16,16 @@ filechooser,
       background-image: linear-gradient(to left, darken($bg_color, 4%) 41px, $bg_color 0);
     }
 
-    &:backdrop { box-shadow: none; }
+    &:backdrop { background-image: none; }
 
     row.sidebar-row {
       &:selected {
-        @extend %selected_items;
-
         margin-left: 6px;
         margin-right: 6px;
         border-radius: $button_radius;
         box-shadow: $_glow_shadow;
         transition: box-shadow $backdrop_transition;
-
-        &:backdrop { box-shadow: none; }
+        background-color: $selected_bg_color;
 
         &:dir(ltr) {
           background-image: linear-gradient(to right, darken($selected_bg_color, 10%) 35px, transparent 0);
@@ -43,6 +40,16 @@ filechooser,
 
           .sidebar-icon, .sidebar-label { color: $selected_fg_color; }
         }
+
+        &:backdrop {
+          @extend %selected_items_backdrop;
+          box-shadow: none;
+          background-image: none;
+
+          &,
+          & .sidebar-icon,
+          & .sidebar-label { color: mix($backdrop_selected_fg_color, $selected_bg_color, 30%); }
+        }
       }
 
       .sidebar-icon { padding-right: 20px; }
@@ -74,6 +81,11 @@ filechooser,
 
 .path-bar-box:backdrop { border-color: $backdrop_borders_color}
 
+/* GNOME TWEAKS */
+list.tweak-categories separator {
+  background: transparent;
+}
+
 /* XFCE4 PANEL */
 .xfce4-panel {
   &.background { background: $panel_bg; }

src/themes/Kali/sass/gtk3/_common-tweaks.scss

@@ -385,6 +385,21 @@ infobar {
   }
 }
 
+/*********
+ * Lists *
+ *********/
+row {
+  &:selected, &.activatable:selected {
+    &, &:backdrop, &:active {
+    border-radius: $button_radius + 4px;
+    background-color: $bg_color;
+    color: $text_color;
+    box-shadow: inset 0 0 0 9999px $menu_selected_color,
+                inset 0 0 0 3px $base_color;
+    }
+  }
+}
+
 /*********************
  * App Notifications *
  *********************/
@@ -407,8 +422,6 @@ calendar {
   border-radius: 6px;
   border:0;
   padding: 1px;
-
-  &:selected { border-radius: 999px; }
 }
 
 /***********
@@ -424,6 +437,8 @@ messagedialog .titlebar:backdrop { background-image: none; }
   background-color: $bg_color;
 }
 
+stacksidebar row { padding: 7px 3px; }
+
 /****************
  * File chooser *
  ****************/