Fix separator on new issue split button

Chad Lavimoniererequested to merge
20250910-clavimoniere-fix-new-issue-split-button into master

What does this MR do and why?

Override styles applied previously (I added them a year and a half ago in !146394 (merged)) are no longer necessary and now conflict with component styles. This MR removes them.

References

Screenshots or screen recordings

Before After
Screenshot_2025-09-10_at_18.09.32 Screenshot_2025-09-10_at_18.09.11
Viewport size Before After
xs (<576px) gdk.test_3000_groups_flightjs_-_issues gdk.test_3000_groups_flightjs_-issues__9
sm (>=576px) gdk.test_3000_groups_flightjs_-issues__1 gdk.test_3000_groups_flightjs_-issues__8
md (>=768px) gdk.test_3000_groups_flightjs_-issues__2 gdk.test_3000_groups_flightjs_-issues__7
lg (>=992px) gdk.test_3000_groups_flightjs_-issues__3 gdk.test_3000_groups_flightjs_-issues__6
xl (>=1200px) gdk.test_3000_groups_flightjs_-issues__4 gdk.test_3000_groups_flightjs_-issues__5

How to set up and validate locally

  1. Check out this branch
  2. Visit a project issues page, a group issues page, or a user issues dashboard
  3. You will observe that at various viewport sizes, the new issue button's layout and behavior are unchanged, but the separator between the button and the dropdown trigger is restored.

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