[goffice] Ring plot: fix persistence of center size.

[Morten Welinder <mortenw src gnome org>]

commit c0202b4872eaf6c4de047c1b95e713f32c89c169
Author: Morten Welinder <terra gnome org>
Date:   Mon Apr 13 10:17:42 2015 -0400

    Ring plot: fix persistence of center size.

 ChangeLog                  |    5 +++++
 NEWS                       |    1 +
 plugins/plot_pie/gog-pie.c |    2 +-
 3 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index c35ef94..cd5bfa5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2015-04-13  Morten Welinder  <terra gnome org>
+
+       * plugins/plot_pie/gog-pie.c (gog_ring_plot_class_init): Persist
+       the center size.
+
 2015-04-13  Jean Brefort  <jean brefort normalesup org>
 
        * goffice/data/go-data-simple.c (go_data_scalar_val_new): ensure that
diff --git a/NEWS b/NEWS
index b12f8b1..c9835d9 100644
--- a/NEWS
+++ b/NEWS
@@ -17,6 +17,7 @@ Morten:
        * Don't force radial plots to include 0 for log axis.
        * Rewrite pattern-fill rendering.  [#747212]
        * Add go_cotpi and go_atan2pi.
+       * Fix persistence of ring plot center size.
 
 --------------------------------------------------------------------------
 goffice 0.10.21:
diff --git a/plugins/plot_pie/gog-pie.c b/plugins/plot_pie/gog-pie.c
index cf16962..80e4f7c 100644
--- a/plugins/plot_pie/gog-pie.c
+++ b/plugins/plot_pie/gog-pie.c
@@ -461,7 +461,7 @@ gog_ring_plot_class_init (GogPiePlotClass *pie_plot_klass)
                        _("Center-size"),
                        _("Size of the center hole as a percentage of the radius"),
                        0, 100., 0.,
-                       GSF_PARAM_STATIC | G_PARAM_READWRITE));
+                       GSF_PARAM_STATIC | G_PARAM_READWRITE | GO_PARAM_PERSISTENT));
 
        plot_klass->desc.num_series_max = G_MAXINT;
        plot_klass->desc.series.style_fields = GO_STYLE_OUTLINE | GO_STYLE_FILL;