https://bugzilla.wikimedia.org/show_bug.cgi?id=17052
Summary: Misleading diffs involving revisions deleted through
RevisionDelete
Product: MediaWiki
Version: unspecified
Platform: All
OS/Version: All
Status: NEW
Severity: minor
Priority: Normal
Component: Deleting
AssignedTo: [email protected]
ReportedBy: [email protected]
Blocks: 15644
It is clearly not supposed to be possible to diff to a deleted revision that
you can't view the content of, since the radio buttons on the history page are
greyed out, as are the 'cur' / 'prev' links as applicable. However, it is
still possible to get a diff in a number of ways.
Firstly, if the second-most-recent revision of a page is concealed, the radio
button marker is still positioned on it by default (although if you move it,
you can't put it back). It should be a simple check on data that's already
present to see if the second revision is deleted (the first can't be) and move
the radio button default down one if so.
Secondly, if you diff to the revision before a deleted one, the "next diff"
link is still available, and takes you to the diff with the deleted revision.
The problem with diffing to a deleted version is that the diff function
silently returns a 'nothing changed' diff just like when you diff to a 'null'
revision (eg a "this page was moved/protected" rev). In this case, that's
disingenous: it should not be allowed to present a diff involving content the
user can't see, and an explanation of the issue should be provided. It seems
fairly pointless to allow the diff but not allow it to contain any useful
information.
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