[meld] Fix some sensitivity setting in no-document cases (closes bgo#682162)

[Kai Willadsen <kaiw src gnome org>]

commit 03bab50d7e6ec3e01840eb02572cb7d96b2d6538
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Mon Oct 29 06:53:38 2012 +1000

    Fix some sensitivity setting in no-document cases (closes bgo#682162)

 meld/meldwindow.py |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/meld/meldwindow.py b/meld/meldwindow.py
index 26f1d21..d2c19c1 100644
--- a/meld/meldwindow.py
+++ b/meld/meldwindow.py
@@ -181,6 +181,10 @@ class MeldWindow(gnomeglade.Component):
         (keyval, mask) = gtk.accelerator_parse("<Ctrl>E")
         accels.connect_group(keyval, mask, 0, self.on_menu_edit_up_activate)
 
+        # Initialise sensitivity for important actions
+        self.actiongroup.get_action("Stop").set_sensitive(False)
+        self._update_page_action_sensitivity()
+
         self.appvbox.pack_start(self.menubar, expand=False)
         self.appvbox.pack_start(self.toolbar, expand=False)
         self._menu_context = self.statusbar.get_context_id("Tooltips")
@@ -291,6 +295,14 @@ class MeldWindow(gnomeglade.Component):
         self.actiongroup.get_action("MoveTabPrev").set_sensitive(have_prev_tab)
         self.actiongroup.get_action("MoveTabNext").set_sensitive(have_next_tab)
 
+        have_focus = current_page != -1
+        self.actiongroup.get_action("Close").set_sensitive(have_focus)
+        self.actiongroup.get_action("Refresh").set_sensitive(have_focus)
+        self.actiongroup.get_action("Reload").set_sensitive(have_focus)
+        if not have_focus:
+            self.actiongroup.get_action("PrevChange").set_sensitive(False)
+            self.actiongroup.get_action("NextChange").set_sensitive(False)
+
     def on_switch_page(self, notebook, page, which):
         oldidx = notebook.get_current_page()
         if oldidx >= 0:
@@ -570,6 +582,7 @@ class MeldWindow(gnomeglade.Component):
             self.notebook.remove_page(page_num)
             if self.notebook.get_n_pages() == 0:
                 self.widget.set_title("Meld")
+                self._update_page_action_sensitivity()
         return response
 
     def on_file_changed(self, srcpage, filename):