update

src/_sass/gtk/_common-3.20.scss

@@ -1062,7 +1062,6 @@ searchbar > revealer > box,
 searchbar > revealer > box {
   // workaround: undo the GtkContainer:border-width and use CSS padding instead
   margin: -6px;
-  padding: $container-padding;
 }
 
 

src/_sass/gtk/_common-4.0.scss

@@ -1264,10 +1264,6 @@ searchbar > revealer > box {
         padding: 0;
       }
     }
-
-    // workaround for non-animatable buttons
-    .background:not(.csd) & windowcontrols button:active,
-    .background:not(.csd) & windowcontrols menubutton:active {background-size: 1000% 1000%};
   }
 
   .solid-csd & {
@@ -3706,13 +3702,13 @@ window {
       &:backdrop { background-color: $titlebar-backdrop; }
     }
 
-    // .maximized &,
+    &.maximized,
-    // .fullscreen &,
+    &.fullscreen,
-    // .tiled &,
+    &.tiled,
-    // .tiled-top &,
+    &.tiled-top,
-    // .tiled-right &,
+    &.tiled-right,
-    // .tiled-bottom &,
+    &.tiled-bottom,
-    // .tiled-left & { border-radius: 0; }
+    &.tiled-left { border-radius: 0; }
   }
 }
 

src/gnome-shell/sass/widgets/_panel.scss

@@ -24,6 +24,7 @@ $panel_transition_duration: 250ms; // same as the overview transition duration
     border-radius: $circular_radius;
     height: $medium_size + 2px;
   }
+
   // transparent panel on lock & login screens
   &.unlock-screen,
   &.login-screen,