fixes 'Diff with previous window'

Author: colinta

file_diffs.py

@@ -377,9 +377,10 @@ def record_current_view(view):
 
 class FileDiffListener(sublime_plugin.EventListener):
     def on_activated(self, view):
+        # Prevent 'show_quick_panel()' of 'FileDiffs Menu' from being recorded
+        if view not in view.window().views():
+            return
         try:
-            # Prevent 'show_quick_panel()' of 'FileDiffs Menu' from being recorded
-            view.window().views()
             if current_view is None or view.id() != current_view.id():
                 record_current_view(view)
         except AttributeError: