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Fix gallery tab order #15540
This PR fixes the keyboard tab order for navigating through gallery items:
There is a related issue #14823 for deselecting the image when it is the first/last after it losses focus. This will be fixed separately.
requested review from
May 9, 2019
Note that the caption's toolbar is part of the tab stops when tabbing backward but not forward. Making it work identical for both cases would require the caption's toolbar to always be visible for the selected GalleryImage, not only when the caption is selected.