[meld] dirdiff: Fix expand/collapse sensitivity for fake empty rows (#342)

[Kai Willadsen <kaiw src gnome org>]

commit 450a9bf00680e1a9521d89f4c930e9c5894a7c82
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Fri Jun 21 09:21:42 2019 +1000

    dirdiff: Fix expand/collapse sensitivity for fake empty rows (#342)
    
    We add path-less rows to the model to represent empty folders, which the
    existing selection code wasn't handling. With this change, we don't try
    to figure out whether the current selection is a folder... we just look
    to see whether the model has children, which is both easier and more
    correct.

 meld/dirdiff.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)
---
diff --git a/meld/dirdiff.py b/meld/dirdiff.py
index 4b41e125..f675a403 100644
--- a/meld/dirdiff.py
+++ b/meld/dirdiff.py
@@ -1125,9 +1125,7 @@ class DirDiff(Gtk.VBox, tree.TreeviewCommon, MeldDoc):
             if (selection.count_selected_rows() == 1):
                 path = selection.get_selected_rows()[1][0]
                 it = self.model.get_iter(path)
-                os_path = self.model.value_path(it, pane)
-                is_single_foldable_row = self.model.is_folder(
-                    it, pane, os_path)
+                is_single_foldable_row = self.model.iter_has_child(it)
 
             self.set_action_enabled('folder-collapse', is_single_foldable_row)
             self.set_action_enabled('folder-expand', is_single_foldable_row)