Auto-sizing form label doesn't align correctly with custom form controls

[andresgalante]

Since the custom select has a width: 100% here the custom select goes to a new line when there is a label:

I've added a sr-only class to the label on #26615 to fix the docs.

If an author wants to use a label with a custom element they can use the form-inline class on the form element and it'll work just fine, but not with Auto-sizing.

[mdo]

Yeah, we could override this to width: auto I think?

[mdo]

I think I'm going to close this as a won't fix? Only viable option I see here is to customize the .col-auto with some utilities (e.g., d-flex and margins).