* Reland "Fixes zero route transition duration crash (#90461)"

This reverts commit 403c1de5.

* Fix paged base route pop before push finishes crashes

SelectableText defers to EditableText for wantKeepAlive, plus improved docs.

This reverts commit 988959da.

This reverts commit 9412edf1.

This reverts commit 0eeb026e.

For https://github.com/flutter/flutter/issues/91625

@blasten @GaryQian

* 9b200e156 Roll Dart SDK from 9f61c2487bbd to 3a963ff14181 (7 revisions) (flutter/engine#30011)

* fada03555 Use WindowInfoTracker.Companion.getOrCreate instead of the short version (flutter/engine#30012)

* d28047579 Non painting platform views (flutter/engine#30003)

* b420c1646 [macOS] MacOS Keyboard properly handles multi-char characters (flutter/engine#30005)

* 0a6098bcf [Win32, keyboard] Fix dead key events that don't have the dead key mask (flutter/engine#30004)

* 8ac9366c7 Fix sceneElement analysis error (flutter/engine#30038)

* 5ad06c213 Share the io_manager between parent and spawn engine (flutter/engine#29915)

* 69be405e8 Run Dart VM tasks on the engine's ConcurrentMessageLoop instead the VM's separate thread pool. (flutter/engine#29819)

* c85a129b4 Roll Dart SDK from 3a963ff14181 to 8bb2e56ec900 (4 revisions) (flutter/engine#30045)

* abf6c34ea Eliminate hardcoded scale factor in a11y scroll (flutter/engine#30013)

* d184d9b45 Roll Skia from fa183572bfd3 to d3399178196e (17 revisions) (flutter/engine#30047)

* 476ed30dd Roll web_installers simulators package (flutter/engine#30035)

* 62113c4f5 Revert dart to 9f61c2487bbd (flutter/engine#30056)