Updated mediawiki/extensions
Project: mediawiki/extensions/GuidedTour  2c62053c305ee25de4e151e4625d0dc003f9e871

Filter out elements that are not :visible when attaching.

Thus, if the only candidate(s) are non-:visible elements, it will
fallback to the center, as with entirely missing elements.

Non-:visible elements are not handled by jQuery offset, so
_getAttachCss returns meaningless values (e.g. (0, 0)) for them.

To do this consistently, this introduces a small private helper method,
guiders._getAttachTarget.

Change-Id: Ic862e14022ae6e1b21b1241c36a619b398a8eccf