Last modified: 2007-05-09 22:45:14 UTC
Clicking undo from a page showing the diff for non-consecutive revisions should
attempt to undo the cumulative effect of all of the intervening edits, not
merely the final edit.
For example, consider an article with four consecutive revisions, r1,r2,r3,r4.
If I view the diff page for diff(r2,r3) I can currently hit undo to try to patch
r4 with diff(r3,r2). This is good.
However, if I view diff(r1,r3) and hit undo, r4 is still just patched with
diff(r3,r2); that is, only one edit is undone. I think that r4 should be patched
with diff(r3,r1) to undo the cumulative effect of both edits between r1 and r3.
This would be useful if, for example, both of these edits are vandalism.
The current behaviour is also confusing, as the effect of hitting undo does not
correspond with what is displayed on the diff page diff(r1,r3).
There's also been talk of removing the (undo) button from multi-revision diffs.
I think this is probably a more sensible option.
I think probably less. Why drop a potentially handy feature rather than
Created attachment 2865 [details]
DiffEng: change Undo link construction for undoing several edits
Created attachment 2866 [details]
EditPage: Undo uses two params now; can revert several edits
Created attachment 2868 [details]
Update editpage; change summary schema
OK, this now uses "undo-summary" language only when one revision was undone and
"undo-summary_set" for muli-edit undoing.
The following can then be added to the en lang stuff:
'undo-summary_set' => 'Undo revisions $1 (by [[Special:Contributions/$3]]) to
$2 (by [[Special:Contributions/$4]])'
The other 6 (and later more) langs need updating as well for this to work.
Those links above aren't piped...
Actually, for multi edit reverts, the summary should just use regular userpage
links given the cutoff length.
Created attachment 2869 [details]
Update; DiffEng, remove undo links from top diffs
Created attachment 2908 [details]
DiffEng; put undo links back on top diffs
Done in r20317.
I've reverted that in r20755; it appears to make incompatible changes to the URI
parameters for operating the undo feature, which is:
a) gratuitously annoying
b) would break user JS tools based on it
Re-done in r20785.
The automatic edit summary for undoing multiple versions was in the original
attachment 2868 [details] but was never implemented. Could someone add that in?
Created attachment 3609 [details]
Last part of attachment 2868 [details], which wasn't applied
Setting backed to fixed, the bug was to enable multi-edit undo and it was done.
Summaries for multi-edit undo must be manual, as any automatic one would just be
to hard to read and be useful.
If you want summaries for that anyway, make a new bug report.