The recent form styling fixes ended up causing neighboring some

neighboring form rows to be squashed together in some cases, and nested

fieldsets to have too much additional padding. Help text also got

squashed a bit with neighboring fields.
This was caused by a few things:


Some assumptions that the first and last form rows in a fieldset

   should have their padding trimmed.


Usage of padding instead of margin in places, which contributed

   to extra unwanted padding.


Always applying padding to the top and bottom of

.rb-c-fieldset__fields, even when nested.


This has been addressed by switching to margin in several places,

restoring top/bottom spacing for field rows and collections of fields in

all cases, and then ensuring that subforms don't have padding or margins

in their subform-level `__fields`` container (if present).

Went through every settings page and subform, various database pages

(repository, user, webhook, review groups, default reviewers), and the

My Account pages, checking for consistency in presentation.
There are still cases where the larger form row padding is less than

ideal (groups of checkboxes, for example), but that would have to be

solved separately.