Reland “Add more tests to slider to avoid future breakages (#98772)” by @goderbauer in https://github.com/flutter/flutter/pull/98936

Enable use_if_null_to_convert_nulls_to_bools lint by @tgucio in https://github.com/flutter/flutter/pull/98753

Remove redundant hide handles API from TextSelectionDelegate by @chunhtai in https://github.com/flutter/flutter/pull/98944

Test that render object changed its visual appearance after texture is create by @blasten in https://github.com/flutter/flutter/pull/98622

Add actionsOverflowAlignment parameter to dialog by @himamis in https://github.com/flutter/flutter/pull/95995