Ensure that the spell checker gets removed with the editor

Fixes #13795.

Author: Nick-Hall

gramps/gui/widgets/styledtexteditor.py

@@ -373,6 +373,10 @@ def __init__(self):
         # variable to not copy to clipboard on double/triple click
         self.selclick = False
 
+    def __del__(self):
+        # ensure that the spell checker gets removed with the editor (bug #13795)
+        self.spellcheck = None
+
     # virtual methods
 
     def do_match_changed(self, match):