Last modified: 2013-08-16 03:09:03 UTC
Tested on Firefox 22 (Monobook) and Chrome 28 (Vector) Steps to reproduce: - Open any random page in the visual editor. Personally i used [[Botnet]]. - Add the word "Test" to the page. - Press Ctrl + Z to undo the edit. Keep pressing till the edit is gone, then press it once more. Once you have done this, the Redo button and the Redo shortcut (Ctrl+Shift+Z) no longer seem to restore the previous edits. Any subsequent edit seems to reset the undo / redo buttons to an "There were no previous edits" state. Inconsistent results: Besides the above result that i can always reproduce using these steps, i have seen various other results. I have seen each of these at least twice but no matter what i try, i cannot seem to find any method of reproducing these reliably. - An entry in the console log stating "Error: Cannot roll back a transaction that has not been committed " - An entry in the console log stating "Error: Range error: Range is no longer valid after DOM mutation ([WrappedRange("Zz":1, "Zz":1)]) " - The redo button suddenly inserting "♙" once in Chrome. - The undo button suddenly inserting an endless steam "♙" in Firefox.
I've reproduced a few of these permutations.
It's obviusly inviting you to play chess :)
Change 79049 had a related patch set uploaded by Esanders: Check for past/future state in undo/redo before setting breakpoint https://gerrit.wikimedia.org/r/79049
Change 79049 merged by jenkins-bot: Check for past/future state in undo/redo before setting breakpoint https://gerrit.wikimedia.org/r/79049
Now merged into master; will be deployed in the next push.
