[WIP] pat-modal: mutationobserver #927
                
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[WIP]
Rethink usage of mutation observer. Maybe use
debounceto not constantly fire events when the DOM tree changes?See this discussion/explanation:
https://stackoverflow.com/questions/31659567/performance-of-mutationobserver-to-detect-nodes-in-entire-dom/39332340
https://stackoverflow.com/questions/14377590/queryselector-and-queryselectorall-vs-getelementsbyclassname-and-getelementbyid