This pull requests adds a new `actionsPadding` property to AppBar, which controls the padding of the actions row's end. By default, no padding is added.
As it was already discussed in the linked issue below (https://github.com/flutter/flutter/issues/115349#issuecomment-1315582192), it is not feasible to change defaults. This PR is an interim solution to allow developers to change layout across the app, until that change/transition can be made (see: the new TODO line).
Different to the original code from 2018, this PR only adds padding to the actual actions row, instead of the entire `NavigationToolbar`.
Fixes#155747
0ce5285051