Updated EditableText scroll into view behavior

The Editable.onCaretChanged callback is removed. With this change, EditableText behavior for scrolling the selection into view changes.

Previously, upon scrolling into view to show user updates, EditableText used multiple mechanisms to determine the extent of the selection or the caret location.

By removing the Editable.onCaretChanged callback, EditableText will always use the most up-to-date selection extent location when scrolling to show it. Specifically, this improves scroll into view behavior after changing selection from collapsed to non-collapsed using userUpdateTextEditingValue().

Landed in version: 3.12.0-4.0.pre
In stable release: 3.13.0

API documentation:

• EditableText

Relevant PRs:

• 109114: Remove Editable.onCaretChanged callback