[Webkit-unassigned] [Bug 79402] [Qt] Font related problem with newer Qt5

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=79402





--- Comment #5 from Simon Hausmann <hausmann at webkit.org>  2012-02-24 03:22:04 PST ---
I spent a bit of time looking into this and this is what I think happened:

There are two differences that we can observe, a difference in _metrics_ (*-expected.txt) as well as in the _visual rendering_ (attached png files).

I do believe the difference in the png files is _not_ caused by any _recent_ changes (i.e. from last week's qt5 pinned hash to current one), but by some more general changes in Qt 5. I don't think we should do anything about them until we drop support for Qt 4.

The difference in _metrics_ I believe is caused by an intentional behavioural change in Qt 5 http://codereview.qt-project.org/#change,15169 (or by one of its follow-up patches).

I'm looking into compensation for this in WebKit to give us Qt 4 like results. In the future perhaps we can make the Qt 4 rendering behave like Qt 5 (in terms of metrics) and rebase all our results (or drop qt4 and rebase anyway).

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