[gtk/wip/jimmac/suggested-destructive-focus] Adwaita: suggested destrictive button focus

[Jakub Steiner <jimmac src gnome org>]

commit efd009e6d839bbd31798a9378e5ced6a8c945c05
Author: Jakub Steiner <jimmac gmail com>
Date:   Wed May 6 16:12:57 2020 +0200

    Adwaita: suggested destrictive button focus
    
    Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/2704

 gtk/theme/Adwaita/_common.scss | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 5e8342f864..894e9a51de 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -676,6 +676,7 @@ button {
                              (destructive-action, $destructive_color) {
     &.#{$b_type} {
       @include button(normal, $b_color, white);
+      @include focus-ring($fc: transparentize(white,0.1));
 
       &.flat {
         @include button(undecorated);