https://bugzilla.wikimedia.org/show_bug.cgi?id=42479
Web browser: ---
Bug #: 42479
Summary: stall causes problems in IE when its callback returns
something that's not a Deferred object
Product: MediaWiki extensions
Version: master
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: E3 Experiments
AssignedTo: wikibugs-l@lists.wikimedia.org
ReportedBy: bjor...@wikimedia.org
CC: asha...@wikimedia.org, oliv...@wikimedia.org,
sp...@wikimedia.org, swall...@wikimedia.org
Classification: Unclassified
Mobile Platform: ---
See [[en:Wikipedia:Village pump (technical)#Can't go directly to feedback
pages]].
The 'stall' method installs an event handler that calls a callback which is
expected to return a Deferred object, queues up a "re-fire the event" function
for when that Deferred object resolves, and then returns false for the original
event.
But if the callback returns something other than a Deferred object (e.g. as
AFTv5 does if $.aftTrack.clickTrackingOn is false), returns an already-resolved
Deferred object, or throws an exception, stall will try to re-fire the event
before the original event handler returns. This causes problems in IE at least
for the 'click' event, as the re-fired click is ignored.
Also, it seems if the Deferred object returned by the callback is rejected,
stall will never re-fire the event since it only attaches a "done" handler and
not a "fail" handler. I don't know whether or not this is intended behavior.
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