[goffice] Fixed matrix plot update.

[Jean Bréfort <jbrefort src gnome org>]

commit 84df718cdc3f743f0cf69de14768c93c7355eab2
Author: Jean Brefort <jean brefort normalesup org>
Date:   Mon Jun 10 22:09:29 2013 +0200

    Fixed matrix plot update.

 ChangeLog                         |    5 +++++
 plugins/plot_surface/gog-matrix.c |    2 +-
 2 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index 70c7165..1fbabc1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2013-06-10  Jean Brefort  <jean brefort normalesup org>
 
+       * plugins/plot_surface/gog-matrix.c (gog_matrix_view_render): ensure that
+       the plot is always rendered.
+
+2013-06-10  Jean Brefort  <jean brefort normalesup org>
+
        * plugins/plot_surface/gog-xyz-surface-prefs.c
        (cb_missing_as_changed), (gog_xyz_surface_plot_pref): fixed "missing as"
        combo box. 
diff --git a/plugins/plot_surface/gog-matrix.c b/plugins/plot_surface/gog-matrix.c
index ca24c50..3d7373f 100644
--- a/plugins/plot_surface/gog-matrix.c
+++ b/plugins/plot_surface/gog-matrix.c
@@ -141,7 +141,7 @@ gog_matrix_view_render (GogView *view, GogViewAllocation const *bbox)
        if (plot->plotted_data)
                data = plot->plotted_data;
        else
-               return;
+               data = GOG_XYZ_PLOT (plot)->plotted_data = gog_matrix_plot_build_matrix (GOG_XYZ_PLOT (plot), 
NULL);
 
        x_map = gog_axis_map_new (plot->base.axis[0],
                                  view->residual.x , view->residual.w);