Some minimal theme fixes for focus drawing

We don't want focus rectangles everywhere, so set them up
explicitly for the widgets where we want them, and only
if focus(visible) is set.

gtk/theme/Adwaita/_common.scss

@@ -13,7 +13,12 @@ $button_transition: all 200ms $ease-out-quad;
   -gtk-secondary-caret-color: $selected_bg_color
 }
 
-*:focus {
+button:focus(visible),
+checkbutton:focus(visible),
+radiobutton:focus(visible),
+switch:focus(visible),
+scale:focus(visible),
+label:focus(visible) {
   // We use the outline properties to signal the focus properties
   // to the adwaita engine: using real CSS properties is faster,
   // and we don't use any outlines for now.