[gtk/wip/jimmac/emphasize-focus-change] Adwaita: bring more attention to focus change

[Jakub Steiner <jimmac src gnome org>]

commit 9c0d4b7eff3d0802b58db802a34a121693315107
Author: Jakub Steiner <jimmac gmail com>
Date:   Thu Apr 30 22:40:21 2020 +0200

    Adwaita: bring more attention to focus change
    
    - as discussed in https://gitlab.gnome.org/GNOME/gtk/-/issues/2644 it's desirable to bring attention to 
what's focused. Instead of pressing `alt` just simply changing focus with `tab` can have a similar effect
    
    Extends https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/1802

 gtk/theme/Adwaita/_drawing.scss | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/gtk/theme/Adwaita/_drawing.scss b/gtk/theme/Adwaita/_drawing.scss
index 7e67786f1a..7632972320 100644
--- a/gtk/theme/Adwaita/_drawing.scss
+++ b/gtk/theme/Adwaita/_drawing.scss
@@ -10,11 +10,12 @@
 //
 @mixin focus-ring($target: null, $width: 2px, $offset: -$width, $outer: false) {
   & #{$target} {
-    outline: 0 solid $focus_border_color;
+    outline: 6px solid transparent;
     outline-offset: if($outer, $offset, $offset + $width);
   }
 
   &:focus:focus-visible #{$target} {
+    outline-color: $focus_border_color;
     outline-width: $width;
     outline-offset: $offset;
   }