I should not have added in the offset of the multicolumn set in columnTranslationForOffset. This was already accounted for.
Created attachment 230087 [details]
Attachment 230087 [details] did not pass style-queue:
ERROR: LayoutTests/ChangeLog:1: ChangeLog entry has no bug number [changelog/bugnumber] 
ERROR: Source/WebCore/ChangeLog:1: ChangeLog entry has no bug number [changelog/bugnumber] 
ERROR: Source/WebCore/ChangeLog:8: You should remove the 'No new tests' and either add and list tests, or explain why no new tests were possible. [changelog/nonewtests] 
Total errors found: 3 in 6 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Created attachment 230088 [details]
Comment on attachment 230088 [details]
r+ but I think your image has the wrong mime type
Fixed in r167764.