Resize RenderMultiColumnSets around their columns. This gets us inline overflow parity with the old columns in that we at least know to hit test and repaint columns that spill outside of a block in the inline direction now.
Created attachment 189371 [details]
Comment on attachment 189371 [details]
View in context: https://bugs.webkit.org/attachment.cgi?id=189371&action=review
> + LayoutUnit colGap = columnGap();
I guess col is descriptive enough.
Fixed in r143506.