[goffice] Canvas: avoid leak.

[Morten Welinder <mortenw src gnome org>]

commit af9d2dcc849d22bca29e5e77264921075e4f278c
Author: Morten Welinder <terra gnome org>
Date:   Thu Jan 8 17:04:59 2015 -0500

    Canvas: avoid leak.

 ChangeLog                   |    5 +++++
 goffice/canvas/goc-widget.c |    7 +++++++
 2 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 416079d..b55d3d5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-01-08  Morten Welinder  <terra gnome org>
+
+       * goffice/canvas/goc-widget.c (goc_offscreen_box_unrealize): Undo
+       the embedder part of realization too.
+
 2015-01-08  Jean Brefort  <jean brefort normalesup org>
 
        * goffice/graph/gog-axis-line.c (gog_axis_line_get_ticks): don't return
diff --git a/goffice/canvas/goc-widget.c b/goffice/canvas/goc-widget.c
index 23de5df..e7b3b7d 100644
--- a/goffice/canvas/goc-widget.c
+++ b/goffice/canvas/goc-widget.c
@@ -261,6 +261,13 @@ goc_offscreen_box_unrealize (GtkWidget *widget)
 {
        GocOffscreenBox *offscreen_box = GOC_OFFSCREEN_BOX (widget);
 
+       gdk_offscreen_window_set_embedder (offscreen_box->offscreen_window, NULL);
+
+       if (offscreen_box->child) {
+               gtk_widget_unrealize (offscreen_box->child);
+               gtk_widget_set_parent_window (offscreen_box->child, NULL);
+       }
+
        gdk_window_set_user_data (offscreen_box->offscreen_window, NULL);
        gdk_window_destroy (offscreen_box->offscreen_window);
        offscreen_box->offscreen_window = NULL;