Race conditions are now prevented even when the style declaration is unlocked: Bug 192739: Web Inspector: Styles: fix race conditions when editing We can safely remove "property was unlocked" asserts.
Created attachment 361140 [details] Patch
Comment on attachment 361140 [details] Patch rs=me
Comment on attachment 361140 [details] Patch Clearing flags on attachment: 361140 Committed r240970: <https://trac.webkit.org/changeset/240970>
All reviewed patches have been landed. Closing bug.
<rdar://problem/47814025>