[shotwell] Fix background color drawing

[Jens Georg <jensgeorg src gnome org>]

commit 7361b3f909106bfecf01e3ea950984f7dcbf84bf
Author: Jens Georg <mail jensge org>
Date:   Wed May 25 22:57:07 2016 +0200

    Fix background color drawing
    
    Signed-off-by: Jens Georg <mail jensge org>
    
    https://bugzilla.gnome.org/show_bug.cgi?id=766864

 src/CheckerboardLayout.vala |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/src/CheckerboardLayout.vala b/src/CheckerboardLayout.vala
index 30f3d66..3221776 100644
--- a/src/CheckerboardLayout.vala
+++ b/src/CheckerboardLayout.vala
@@ -1808,6 +1808,10 @@ public class CheckerboardLayout : Gtk.DrawingArea {
         // we want switched_to() to be the final call in the process (indicating that the page is
         // now in place and should do its thing to update itself), have to be be prepared for
         // GTK/GDK calls between the widgets being actually present on the screen and "switched to"
+
+        Gtk.Allocation allocation;
+        get_allocation(out allocation);
+        get_style_context().render_background (ctx, 0, 0, allocation.width, allocation.height);
         
         // watch for message mode
         if (message == null) {
@@ -1829,7 +1833,6 @@ public class CheckerboardLayout : Gtk.DrawingArea {
             int text_width, text_height;
             pango_layout.get_pixel_size(out text_width, out text_height);
             
-            Gtk.Allocation allocation;
             get_allocation(out allocation);
             
             int x = allocation.width - text_width;