Tabs inkbar position not recalculated on programmatical width change

[VagrantAI-c]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Recalculate inkbar position on width change or provide method for programmatical tabs inkbar position recalculation (e.g. MatTabGroup.recalculateInkBar()).

What is the current behavior?

There is no such option.

What is the use-case or motivation for changing an existing behavior?

For example I have my tabs labels aligned to center (according to material tabs specs there is possibility for such behavior) and then I try to add some additional content with possible overflow (or just change width). Inkbar position not recalculated.
https://stackblitz.com/edit/angular-material2-issue-rvp1z2?file=app%2Fapp.component.html

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Angular 5.2.8 and 6.0.0-beta.7
Material 5.2.4 and 6.0.0-beta.4
Any OS, any mobile and desktop browser

[johnedvard]

I have a similar problem. the ink bar is not aligned properly when the sidenav is opened. Here is a question I asked on Stack Overflow https://stackoverflow.com/q/49485527/1471485 about the issue

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