[gtk] coloreditor: Draw a focus around the color plane

[Matthias Clasen <matthiasc src gnome org>]

commit 9ce58bdb0c751e6bb3c244d258b9f80d340d45f1
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Apr 9 14:11:18 2020 -0400

    coloreditor: Draw a focus around the color plane
    
    Not doing it was just an oversight.

 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 cca5b1d806..24a0db293c 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -57,6 +57,7 @@ flowboxchild:focus(visible) {
 }
 
 // Widgets that draw their focus indicator outset and not inset
+plane:focus(visible),
 scale:focus(visible) > trough {
   outline-color: $focus_border_color;
   outline-style: solid;