Set mustHaveApp for all window classes

etgtools/tweaker_tools.py

@@ -230,6 +230,10 @@ def fixWindowClass(klass, hideVirtuals=True, ignoreProtected=True):
     """
     Do common tweaks for a window class.
     """
+    # NOTE: it may be okay to just do this for top-level windows
+    # TODO: look into that possibility
+    klass.mustHaveApp()
+
     # The ctor and Create method transfer ownership of the this pointer to the parent
     for func in klass.findAll(klass.name) + klass.findAll('Create'):
         if isinstance(func, extractors.MethodDef):
@@ -269,6 +273,8 @@ def fixTopLevelWindowClass(klass, hideVirtuals=True, ignoreProtected=True):
     """
     Tweaks for TLWs
     """
+    klass.mustHaveApp()
+
     # TLW tweaks are a little different. We use the function annotation for
     # TransferThis instead of the argument annotation.
     klass.find(klass.name).findOverload('parent').transfer = True