[meld: 7/8] [FIX] as a object's field is enough.

[Kai Willadsen <kaiw src gnome org>]

commit 5d0cffb4df7e1642b7735899ff8c8d4ac094f250
Author: Helly Guo <buffoonguo gmail com>
Date:   Mon Feb 28 09:03:14 2022 +0800

    [FIX] as a object's field is enough.

 meld/dirdiff.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meld/dirdiff.py b/meld/dirdiff.py
index 336f1c41..f99b7167 100644
--- a/meld/dirdiff.py
+++ b/meld/dirdiff.py
@@ -422,8 +422,6 @@ class DirDiff(Gtk.VBox, tree.TreeviewCommon, MeldDoc):
         tree.STATE_MODIFIED: ("modified", "folder-status-modified"),
     }
 
-    marked = None
-
     def __init__(self, num_panes):
         super().__init__()
         # FIXME:
@@ -644,6 +642,8 @@ class DirDiff(Gtk.VBox, tree.TreeviewCommon, MeldDoc):
 
         self._scan_in_progress = 0
 
+        self.marked = None
+
     def queue_draw(self):
         for treeview in self.treeview:
             treeview.queue_draw()