User story: N/A
Steps to reproduce:
- go to a page containing depicts tags e.g. https://commons.wikimedia.beta.wmflabs.org/wiki/File:Kinder_spelen-Catchpenny_print_KB-Borms_0554.jpeg
- click 'mark as prominent' on one of the depicts statements
- click 'cancel' to return to read mode
- you'll get a dialog asking 'are you sure? changes will not be saved' - click 'ok'
- try to reload the page - you'll get a msg saying 'this page is asking you to confirm that you want to leave ...', but you shouldn't be getting the msg because you cancelled your change and none of the data has changed
- leave page confirmation popup not shown when data has not changed