[Development] Backporting QTextLayout Performance Improvements to Qt4

Milian Wolff mail at milianw.de
Mon Nov 18 11:06:57 CET 2013

Hey all,

I'd like to ask again whether I could backport some performance improvements 
in QTextLayout/QTextEngine from Qt5 to Qt4.

Most notably there is https://codereview.qt-project.org/#change,34112 which 
effects us in Kate/KDE as outlined here: 

The changeset above was merged in Qt5 and matured there, see

What I propose is to sync the current status of QTextLayout/QTextEngine from 
Qt5, put it into a patchset for Qt4 and get it into the next Qt4 release.

Would this be accepted? Or is there still a policy which forbids performance 
improvements to be merged into Qt4? Considering that the above makes the Kate 
editor practically useless for some files (freezes for multiple minutes), I 
personally see this as a bug fix anyways...

Milian Wolff
mail at milianw.de

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