Let InkWell/Ink/ancestor support GlobalKey so that splash does not stop when changing position. (#71138)

This reverts commit e007cad2.

[flutter_tools] separate concept of null safe language version from current language version (#79052)

* Fix rendereditable to check the latest text before setting the selection

* add regression comment

* addressing comments and fix tests

This reverts commit e34f3b01.

* Update icons

* remove trailing blank line

This reverts commit d3ee5ace.

Resolved contradictory documentation of showGeneralDialog and default value of 'barrierLabel' argument (#78890)

[flutter_tools] migrate tool_backend.dart to null safety and add testing of exit conditions (#78988)