Reland "Prevent viewport.showOnScreen from scrolling the viewport if the specified Rect is already visible. (#56413)" reverted in #64091 (#64513)

* fix bug when tap ListTitle when tristate enable #63846

* fix bug when tap ListTitle when tristate enable #63846

* code style

* improve the unit test case

* bow to convention

Reland "Prevent material switch from recreating its render object when it becomes disabled (#61398)", reverted in #64062 (#64354)

Revert "Prevent material switch from recreating its render object when it becomes disabled (#61398)" (#64062)

Revert "Prevent viewport.showOnScreen from scrolling the viewport if the specified Rect is already visible.  (#56413)" (#64091)

This reverts commit 64d76f2f.

Prevent viewport.showOnScreen from scrolling the viewport if the specified Rect is already visible.  (#56413)

* Fix sort indicator for DataTables

As per material spec ascending order should be shown via an upward arrow
This commit changes the displayed arrows accordingly.

* Test sort indicator orientation in DataTable

* Add punctuation for unterminated sentences in doc comments

* Addressing review nit

Create a new TextSelectionTheme for text selection properties.