[Development] Backporting QTextLayout Performance Improvements to Qt4

Knoll Lars Lars.Knoll at digia.com
Mon Nov 18 11:11:40 CET 2013

Yes, once the patch is in 5.x and it affects 4.8 as well, it¹s usually ok
to back port.


On 18.11.13 11:06, "Milian Wolff" <mail at milianw.de> wrote:

>Hey all,
>I'd like to ask again whether I could backport some performance
>in QTextLayout/QTextEngine from Qt5 to Qt4.
>Most notably there is https://codereview.qt-project.org/#change,34112
>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
>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
>improvements to be merged into Qt4? Considering that the above makes the
>editor practically useless for some files (freezes for multiple minutes),
>personally see this as a bug fix anyways...
>Milian Wolff
>mail at milianw.de
>Development mailing list
>Development at qt-project.org

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