[meld/pathlabel] ui.pathlabel: Fix summarisation display with root parents

[Kai Willadsen <kaiw src gnome org>]

commit 8095e1c441354e05e356f18844ce762a40a01b67
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Wed Jan 13 06:53:19 2021 +1000

    ui.pathlabel: Fix summarisation display with root parents

 meld/ui/pathlabel.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/meld/ui/pathlabel.py b/meld/ui/pathlabel.py
index 6cdcaf1f..301a0fb3 100644
--- a/meld/ui/pathlabel.py
+++ b/meld/ui/pathlabel.py
@@ -224,13 +224,15 @@ class PathLabel(Gtk.MenuButton):
                 elided_path = base_path_gfile.get_relative_path(
                     descendant_parent)
 
+        show_parent = not parent.has_parent()
         label_segments = [
-            '…' if base_path_str else None,
+            '…' if not show_parent else None,
             base_path_str,
             '…' if elided_path else None,
             descendant.get_basename(),
         ]
-        label_text = GLib.build_filenamev([s for s in label_segments if s])
+        label_text = parent.get_parse_name() if show_parent else ''
+        label_text += GLib.build_filenamev([s for s in label_segments if s])
 
         self._path_label = label_text
         self.notify('path_label')