[meld/deprecation-cleanup: 6/48] dirdiff: Break sensitivity logic out from selection-changed handling

[Kai Willadsen <kaiw src gnome org>]

commit 39e9a37f3a3cd5876e7d3d4fa58d21b309d6ab0c
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Fri Nov 30 07:36:26 2018 +1000

    dirdiff: Break sensitivity logic out from selection-changed handling

 meld/dirdiff.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/meld/dirdiff.py b/meld/dirdiff.py
index cb27fe1c..aa10f539 100644
--- a/meld/dirdiff.py
+++ b/meld/dirdiff.py
@@ -1065,7 +1065,16 @@ class DirDiff(MeldDoc, Component):
     def on_treeview_selection_changed(self, selection, pane):
         if not self.treeview[pane].is_focus():
             return
-        have_selection = bool(selection.count_selected_rows())
+        self.update_action_sensitivity()
+
+    def update_action_sensitivity(self):
+        pane = self._get_focused_pane()
+        if pane is not None:
+            selection = self.treeview[pane].get_selection()
+            have_selection = bool(selection.count_selected_rows())
+        else:
+            have_selection = False
+
         get_action = self.actiongroup.get_action
 
         if have_selection: