Andrea Fercia 6551660d55 Accessibility: Improve focus management in the Media Views.
- keeps focus management only where necessary to avoid focus losses
- removes focus management where a specific user workflow was assumed
- makes the "Attachment Details" navigation buttons really disabled when there are no next or previous attachments
- adds inline comments to clarify all the usages of focus()

Fixes #43169.


git-svn-id: https://develop.svn.wordpress.org/trunk@45524 602fd350-edb4-49c9-b593-d223f7449a82
2019-06-12 21:02:03 +00:00
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