Make columns relayout properly when the containing block width changes. Cache the column count and width on the multi-column block.
Created attachment 132623 [details]
Created attachment 132624 [details]
Attachment 132624 [details] did not pass style-queue:
Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1
Source/WebCore/rendering/RenderMultiColumnBlock.h:45: One space before end of line comments [whitespace/comments] 
Total errors found: 1 in 5 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Fixed in r111217.