Patch: dont-suppress-same-user-conflicts
Type: feature

Do not suppress same-user conflicts, but allow to edit page, go back,
edit again, save, go back, edit again... This was the use-case MW authors
were trying to simplify by suppressing conflicts with yourself.

This is achieved by using 'onunload' JS event to store the modified content
and checking it in the case the user clicks "Back" and edits again.

CustIS Bug 61871