[california] Fix black background w/ GtkPopover and Unity/Ambiance: Bug #735421

[Jim Nelson <jnelson src gnome org>]

commit 3442b381ec1183cec406f5a3043d04efd0496370
Author: Jim Nelson <jim yorba org>
Date:   Wed Sep 3 15:47:50 2014 -0700

    Fix black background w/ GtkPopover and Unity/Ambiance: Bug #735421
    
    If a GtkScrolledWindow is present in a GtkGrid (or perhaps just a
    GtkScrolledWindow) which are in a GtkPopover, Unity/Ambiance will
    set the entire grid's background color to black.  Problem corrected
    manually in the code.
    
    ./configure --enable-unity must be used to activate this fix.

 src/host/host-show-event.vala |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/src/host/host-show-event.vala b/src/host/host-show-event.vala
index 5d40370..cc1ab59 100644
--- a/src/host/host-show-event.vala
+++ b/src/host/host-show-event.vala
@@ -118,6 +118,19 @@ public class ShowEvent : Gtk.Grid, Toolkit.Card {
         Calendar.System.instance.today_changed.disconnect(build_display);
     }
     
+#if ENABLE_UNITY
+    // When description_text_window is visible, the entire GtkGrid's background color goes black
+    // in the GtkPopover; this overrides the color and uses GtkPopover's background color for the
+    // GtkGrid.  See:
+    // https://bugzilla.gnome.org/show_bug.cgi?id=735421
+    public override void realize() {
+        base.realize();
+        
+        Gdk.RGBA bg = get_toplevel().get_style_context().get_background_color(Gtk.StateFlags.NORMAL);
+        override_background_color(Gtk.StateFlags.NORMAL, bg);
+    }
+#endif
+    
     public void jumped_to(Toolkit.Card? from, Toolkit.Card.Jump reason, Value? message) {
         // no message, don't update display
         if (message == null)