Add beforeunload event listener when a form is open #311
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This will make the browser prompt the user before they try to reload or close the page if they have a form open.
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This means that the browser will prompt the user before it tries to close the page, that way someone cannot accidentally close the page mid-submission.
Currently this does not work for the home
aelement (Python Discord logo), for some reason it does not appear to trigger thebeforeunloadevent that we subscribe to. Further investigation could be made into adding anonclickto this element that will throw a similar prompt and potentially cancel, or find a way to also triggerbeforeunloadevents when clicking this element.