[UX] Basis: Fix styling of responsive dropdown on smaller screens on RTL

[klonos]

This is a follow-up to #2553

[klonos]

I just wanted to quickly raise this; need to also test multi-level menus.

[jenlampton]

I'd also like to revisit the indentation of child menu items, as that won't work on menus with lots of depth. Maybe removing that can be part of the RTL fixes?

[olafgrabienski]

I'd also like to revisit the indentation of child menu items (...)

@jenlampton Do you suggest to apply the results of a indentation revisit also to LTR? If so, I'd prefer a separate issue.

[jenlampton]

If the fix for both RTL and too-many levels of indentation is removing some or indentation, then we only need one PR. But we do have another issue where we can talk about that: #2370

[olafgrabienski]

But we do have another issue where we can talk about that: #2370

Only, #2370 isn't about the Basis theme (unlike this RTL issue). The issue which introduced the indentation (only for Basis) is #2553. Do you suggest to revoke the indentation also for Basis? If so, I'd like to argue against it, but where? Here some options:

• Add an option to change parent link behavior for responsive dropdown menus. #2370 ... but isn't about Basis
• [UX] Basis: Fix styling of responsive dropdown on smaller screens on RTL #4070 ... is about Basis but specifically about RTL
• [UX] Basis: Improve styling of responsive dropdown on smaller screens #2553 ... is about Basis and introduced indentation but is closed
• New issue ... Makes sense in my opinion, but worth an own issue?