Tweak definition of focusable

[tombrunet]

The current definition exception for immediately losing focus was added due to modal bumpers / focus sentinels. However, if focus is pulled from an item and immediately put back, this definition would consider it as not focusable since it will lose focus. This proposes adjusting the definition to ignore the exception if focus is regained.

Closes issue(s):

• None (identified as part of Focusable element has no keyboard trap via standard navigation - Expectation + add clarification #1909, but doesn't close it)

Need for Call for Review:
This will require a 1 week Call for Review

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[Jym77]

We should have an example of this in one of the "focus" rules.