Liam DeBeasi 2ed0ada923 fix(overlays): focus is returned to last focus element when focusing toast (#28950)
Issue number: resolves #28261

---------

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## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

When moving focus from a focus-trapped overlay to a toast, focus is
moved back to the overlay. This is the correct behavior as focus should
never leave a focus-trapped overlay (unless the overlay is dismissed or
focus is moved to a _new_ top-most overlay). However, the way we return
focus is a bit unexpected because it always returns focus to the last
focusable element in the overlay.

This means that if you were focused on the first focusable element,
presented the toast, and then focused the toast, focus might not be
moved back to that first focusable element. In the case of the linked
issue, this was causing an unexpected scroll so that the last focused
element could be in view.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- This fix adds an exception for `ion-toast` (as it is the only overlay
that is **not** focus trapped) that ensures that focus is moved back to
the last focus element.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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  2. Update the BREAKING.md file with the breaking change.
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## Other information

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screenshots of how the component looks before and after the change. -->


Dev build: `7.7.1-dev.11707253408.186eea70`

Note: We don't recommend this pattern in general because it would be
impossible for a screen reader user to focus the toast. However, we can
at least improve the experience for developers who continue to implement
this pattern by returning focus in a more predictable manner.

Docs: https://github.com/ionic-team/ionic-docs/pull/3432

Testing: 

Reviewers should manually test the following behaviors:

1. Create a modal with 2 buttons. Have one of the buttons present a
toast. Open the toast and verify that you can still Tab to cycle through
the buttons in the modal.
2. Create a modal with 2 buttons. Have one of the buttons present a
toast. Open the toast. Move focus to the toast and verify that you can
still Tab to cycle through the buttons in the modal (once focus is
returned to the modal).
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2015-11-13 21:11:21 -06:00
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