richedit: Don't change text mode with undo or redo stack.
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@ -4319,7 +4319,7 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
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int mask = 0;
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int changes = 0;
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if (ME_GetTextLength(editor))
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if (ME_GetTextLength(editor) || editor->pUndoStack || editor->pRedoStack)
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return E_UNEXPECTED;
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/* Check for mutually exclusive flags in adjacent bits of wParam */
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