[gtk+] Adwaita: Bring fix focus in flowbox

[Matthias Clasen <matthiasc src gnome org>]

commit d3a358b9bd541d3777c06d678b035a5713519994
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Nov 19 16:38:28 2017 -0500

    Adwaita: Bring fix focus in flowbox
    
    Bring back the focus rectangle for flowbox children.
    Its absence makes keynav in flowboxes really difficult.

 gtk/theme/Adwaita/_common.scss |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 3a07eb3..5bad9d7 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -19,7 +19,8 @@ radiobutton:focus(visible),
 switch:focus(visible),
 scale:focus(visible),
 label:focus(visible),
-row:focus(visible) {
+row:focus(visible),
+flowboxchild: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.