Update live edit feature to protect against overwriting modified content #1466
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Updates the live edit feature to protect against overwriting content modified in other tabs/editors. This works by restoring the JavaScript form handler together with a hidden input for the source file hash as it is on the page load. The backend returns a 409 response when the supplied content hash does not match the current one. The frontend then catches the 409 response, prints a JavaScript alert to ask the user if they want to overwrite the page, if they select yes, then the request is send again with a force parameter.