Accessibility: Fix the issue when focus is moved to the post title from More Menu

[gziolo]

Description

Last bug fix which finally resolves #15501. Most of the work has been merged with #14851.

Clicking on "Code Editor" or "Visual Editor" should not move focus to the post title.

The proposed solution checks whether the focus is currently at the body element which reflects the behavior when the post is initially loaded. This happens in addition to the check whether the post is empty.

We might also alternatively completely remove the autofocus behavior from the title textarea field. I'm happy to refine the logic if this is the preferred way.

How has this been tested?

1. Open a new post.
2. Open More Menu.
3. Clicking on "Code Editor" or "Visual Editor" should not move focus to the post title.

Screenshots

Types of changes

Bugfix.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

[afercia]

LGTM thanks @gziolo !

Will create a new issue to determine what should happen when using the keyboard shortcut (on a mac, it's: Shift Option Cmd M)

[gziolo]

Will create a new issue to determine what should happen when using the keyboard shortcut (on a mac, it's: Shift Option Cmd M)

Yes, I didn't think about it. It's all tricky :)