5d422a2e7 Roll Dart SDK from eb912be5af54 to 88b9786db62b (1 revision) (flutter/engine#26724) (#84487)

* Revert "Revert "MouseRegion enter/exit event can be triggered with button pressed (#81148)" (#81557)"

* 7d9e74b4b Roll Fuchsia Mac SDK from jNlbyBr6p... to OP_AFyX5C... (flutter/engine#26701)

* 2aca204e1 Roll Skia from 08ac524b4331 to 2a07fd68ebdd (1 revision) (flutter/engine#26702)

* 1428214ad Roll Dart SDK from d622b98e77d7 to c8a66f8e7ca1 (1 revision) (flutter/engine#26703)

* f3c565a2f Roll Skia from 2a07fd68ebdd to dd84dd09f304 (2 revisions) (flutter/engine#26704)

* 27e512b03 Roll Skia from dd84dd09f304 to bc215ba3bbfe (2 revisions) (flutter/engine#26706)

* 5e02b824a Add support for native callbacks to the macOS embedder test harness (flutter/engine#26694)

* 6ddc14888 Roll Dart SDK from c8a66f8e7ca1 to 935470ea59c4 (1 revision) (flutter/engine#26707)

* 3b80c9384 Roll Skia from bc215ba3bbfe to 1907f9051e17 (1 revision) (flutter/engine#26708)

* 252ad2b45 [web] text_editing_test.dart nnbd; bump test dep (flutter/engine#26709)

* 2b573267d Revert dart rolls (flutter/engine#26714)

* 201ee6f79 Roll Skia from 1907f9051e17 to 9b0841d822c3 (1 revision) (flutter/engine#26713)

3984c21bd Roll Dart SDK from b541bcb9fd3d to d622b98e77d7 (1 revision) (flutter/engine#26700) (#84408)

* Add SizedBox.square() constructor

* Fix comment and move test case to the right file

* Add missing import statement