Android - Fix focus issue when software keyboard is closed

[emmauss]

What does the pull request do?

Removed SoftwareKeyboardListener class form the Android project. Its purpose was to clear focus when software keyboard is closed, and that seems to be wrong behaviour, or unexpected behaviour, as it's up to the input control to remove focus when it decide no more input is needed, and not a global listener.

What is the current behavior?

When the software keyboard is closed, the listener forces focus to be cleared. This removes focus from any input element that triggered the software keyboard to close, like clicking a button to remove focus from an active textbox. This can cancel whatever behaviour the new focused element is expected to do, in this case, a button click when the button is released.

What is the updated/expected behavior with this PR?

This behaviour is removed and the class deleted. We already have api to listen for changes in the software keyboard, that controls can subscribe to to clear focus if they need to.

How was the solution implemented (if it's not obvious)?

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/avalonia-docs with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

Fixes #11884

[avaloniaui-bot]

You can test this PR using the following package version. 11.1.999-cibuild0045357-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]