This reverts commit a24d5566.

This reverts commit 5fd259be.

This reverts commit cb378edc.

I've added a Focus.withExternalFocusNode constructor to the Focus widget (and the FocusScope widget) that makes it explicit that the widget's attributes won't affect the settings of the given focus node.

This is to help address #83023, which is a snag in the API that people run into occasionally.

This should help make it explicit when you want the widget attributes to take precedence, and when you don't.

Prevents bugs related to invalid (-1,-1) selection in keyboard shortcuts

Reland "Make FilteringTextInputFormatter's filtering Selection/Composing Region agnostic" #89327 (#90211)

This adds a smoke test for every single API example. It also fixes 17 tests that had bugs in them, or were otherwise broken, and even fixes one actual bug in the framework, and one limitation in the framework.

The bug in the framework is that NetworkImage's _loadAsync method had await response.drain<List<int>>();, but if the response is null, it will throw a cryptic exception saying that Null can't be assigned to List<int>. The fix was just to use await response.drain<void>(); instead.

The limitation is that RelativePositionedTransition takes an Animation<Rect> rect parameter, and if you want to use a RectTween with it, the value emitted there is Rect?, and one of the examples was just casting from Animation<Rect> to Animation<Rect?>, which is invalid, so I modified RelativePositionedTransition to take a Rect? and just use Rect.zero if the rect is null.

* Fix Dismissible confirmDismiss errors

* +

* refactor test

* fix rebase

* remove new line