[eog-plugins] fit-to-width: Only enable plugin action if zoom is enabled

[Felix Riemann <friemann src gnome org>]

commit bb2f47cb8f8e41e566c349a1fd896f663541c50f
Author: Felix Riemann <friemann gnome org>
Date:   Tue Sep 29 13:42:47 2015 +0200

    fit-to-width: Only enable plugin action if zoom is enabled
    
    If the default zoom actions are not enabled it is unlikely
    the fit-to-width zoom should be enabled as well.
    Also fixes a critical warning if eog is started without an image.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755244

 plugins/fit-to-width/eog-fit-to-width-plugin.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/plugins/fit-to-width/eog-fit-to-width-plugin.c b/plugins/fit-to-width/eog-fit-to-width-plugin.c
index a4d4437..52330fe 100644
--- a/plugins/fit-to-width/eog-fit-to-width-plugin.c
+++ b/plugins/fit-to-width/eog-fit-to-width-plugin.c
@@ -100,6 +100,7 @@ impl_activate (EogWindowActivatable *activatable)
        GMenu *model, *menu;
        GMenuItem *item;
        GSimpleAction *action;
+       GAction *ref_action;
 
        model= eog_window_get_gear_menu_section (plugin->window,
                                                 "plugins-section");
@@ -112,6 +113,15 @@ impl_activate (EogWindowActivatable *activatable)
                         G_CALLBACK (fit_to_width_cb), plugin->window);
        g_action_map_add_action (G_ACTION_MAP (plugin->window),
                                 G_ACTION (action));
+
+       /* Bind to the zoom-normal action's enabled property to only enable
+        * fit-to-width zooming if zooming is generally enabled */
+       ref_action = g_action_map_lookup_action (G_ACTION_MAP (plugin->window),
+                                                "zoom-normal");
+       if (ref_action)
+               g_object_bind_property (ref_action, "enabled",
+                                       action, "enabled",
+                                       G_BINDING_DEFAULT | G_BINDING_SYNC_CREATE);
        g_object_unref (action);
 
        /* Append entry to the window's gear menu */