Last modified: 2014-05-24 02:23:20 UTC
Suppose someone makes a big change on page [[Foo]] or [[Template:Bar]], and gets reverted because some other user found a problem in the new revision. The first user may want to improve its original change, and to do that, he/she may open his/her old version from the page history (i.e., oldid=12345) and then open that old revision for edit (oldid=12345&action=edit). Once the updates are finished, though, there is no way to get a diff of what he/she changed since the last try. He/she will need to save the page first, and only then to get a diff. So, I think it would be good to provide a new button [Show changes since this old revision] on the right side of the existing [Show changes], when editing an old version of a page. See also bug 29674.
*** Bug 41307 has been marked as a duplicate of this bug. ***
This should be easy since the difference between the two features is exactly what is shown on Gerrit change #30113: https://gerrit.wikimedia.org/r/#/c/30113/1/includes/EditPage.php,unified
Copying from bug 41307: ---- If a user open an old revision of a page in edit mode and then click on [Show changes], it will be displayed a diff against the most recent version of the page and not against the version he was editing (sometimes it is this diff which the user wants). Such a feature is available in [[User:Js/ajaxPreview#Extra_features]], and is very useful. See also bug 29674. ----
Doesn't "undo" give a diff?
(In reply to PiRSquared17 from comment #4) > Doesn't "undo" give a diff? If I go to https://en.wikipedia.org/Wikipedia:Sandbox?action=edit&oldid=605309723 and change "Test 1" to "Test 3", there is no "undo" feature which I could use to get a diff (and the button "Show changes" will make a diff against the most recent version of the page, which is not what I want).
Change 135165 had a related patch set uploaded by devunt: Add "Show changes against previous revision" button https://gerrit.wikimedia.org/r/135165
