move all mutations to RenderTreeBuilder
<rdar://problem/37367284>
Created attachment 333427 [details] Patch
Comment on attachment 333427 [details] Patch View in context: https://bugs.webkit.org/attachment.cgi?id=333427&action=review > Source/WebCore/rendering/updating/RenderTreeBuilderMultiColumn.cpp:255 > +static bool gShiftingSpanner = false; Since the builder is stateful this can be later made a member variable.
Comment on attachment 333427 [details] Patch Clearing flags on attachment: 333427 Committed r228320: <https://trac.webkit.org/changeset/228320>
All reviewed patches have been landed. Closing bug.