Adwaita: add a comment

Add a comment pointing to the related bug for the dropdown menu
margin.

diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 17ba5cb5fe3e4731a7f72747961597a9e39fe10e..d5b90e34536aec38ead463dd5fe295c5f0672488 100644 (file)
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1917,7 +1917,7 @@ menubar,
 menu,
 .menu,
 .context-menu {
-  margin: 4px;
+  margin: 4px; // see https://bugzilla.gnome.org/show_bug.cgi?id=591258
   padding: 2px 0px;
   background-color: $menu_color;
   border: 1px solid $borders_color; // adds borders in a non composited env