Steps to Reproduce

1. Create a Flutter application using a TextField.
2. Run your application.
3. Enter the text "01234" in the the field using the keyboard.
4. Select using the mouse "12".
5. Press the right arrow key.

Expected results:

Selection is removed, cursor is placed between "2" and "3".

Actual results:

Selection is removed, cursor is placed between "3" and "4" (off by one error?).

Note that the left cursor works correctly, and moves to the start of the selection. Tested on Linux.