This only affects selected DOM breakpoints. The hovered appearance for the goto arrow for non-selected tree elements is fine.
<rdar://problem/44927654>
Created attachment 351329 [details] [Image] DOM breakpoint tree element (selected) This isn't really the "breakpoint", it's the breakpoint's parent :P
Created attachment 351330 [details] [Image] DOM breakpoint tree element (hovered) Hovered style looks good!
Created attachment 352189 [details] Patch
Created attachment 352191 [details] [Animated GIF] With patch applied
Comment on attachment 352189 [details] Patch rs=me
Comment on attachment 352189 [details] Patch Clearing flags on attachment: 352189 Committed r237078: <https://trac.webkit.org/changeset/237078>
All reviewed patches have been landed. Closing bug.