This reverts commit 43e31977

Simplifying and refactoring parts of RenderEditable. Functionality is the same.

Use the hasStrings clipboard method when possible instead of reading the contents of the clipboard.

Revert "[EditableText] call `onSelectionChanged` only when there're actual selection/cause changes (#87971)" (#88183)

This reverts commit 5f792ba1.

* Randomize tests, exclude tests that fail with randomization.

* Disable some more tool tests

This reverts commit d056500b.

This reverts commit 31de052e.

This reverts commit e2490f29.

Fixes a bug on Android Gboard where the handle would disappear when dragged within a word.

This reverts commit b5f9612c because it is taking about 40% longer to run the tests, which is causing timeouts.

This turns on order shuffling for all tests that don't fail with it on, marking those tests that do fail with a tag so that they will be run without shuffling on.

To determine which tests fail with it on, I ran all the tests 100 times with different random shuffle seeds, and then also ran it with the date seeds from today until the end of July, and tagged all of the test suites (files) that fail, with a seed that caused them to fail.

[TextSelectionControls] move the tap gesture callback into _TextSelectionHandlePainter, remove `_TransparentTapGestureRecognizer`. (#83639)