Created attachment 235808 [details] test case Reproduction steps: 1. Open the attached file in the nightly build of WebKit 2. Find "hello" via Cmd+F. Expected result: "hello" is highlighted Actual result: The yellow highlight shows up on the left of "hello".
The problem here is that RenderMultiColumnFlowThread::mapFromFlowToRegion doesn't add the layer offset when computing the translation offset despite the fact RenderMultiColumnSet::columnTranslationForOffset returns an offset from the layer's top left corner. This is in contract to RenderLayer::collectFragments. It calls RenderMultiColumnSet::collectLayerFragments, which also returns an offset from the layer's top left corner, but it adds the layer offset so everything is fine there.
I found the issue and I have a fix. Working on the patch ATM.
Created attachment 235829 [details] Patch
Comment on attachment 235829 [details] Patch Clearing flags on attachment: 235829 Committed r171882: <http://trac.webkit.org/changeset/171882>
All reviewed patches have been landed. Closing bug.
<rdar://problem/17802531>
*** Bug 135453 has been marked as a duplicate of this bug. ***