Fixes #3160. TextField doesn't update correctly the CursorPosition on Paste. (#3161)

* Remove the old short two digits year and done some cleanup.

* Fixes #3160. TextField doesn't update correctly the CursorPosition on Paste.

* Using TextChanging instead of TextChanged event.

* Removes old IsShortFormat.

* Removing unnecessary private fields and done code cleanup.

* Removes unnecessary GetShortDatePattern method,

* Fix AdjCursorPosition method.

* Create TestDateAttribute.

* Reduces indentation and removes unused using.

* Remove location from constructors parameters.

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Co-authored-by: Tig <[email protected]>