[Development] Backporting QTextLayout Performance Improvements to Qt4

[Milian Wolff]

On Monday 18 November 2013 12:46:24 Olivier Goffart wrote:
> On Monday 18 November 2013 11:06:57 Milian Wolff wrote:
> > 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:
> > https://bugs.kde.org/show_bug.cgi?id=225228
> > 
> > The changeset above was merged in Qt5 and matured there, see
> > https://codereview.qt-project.org/#change,34118
> > 
> > 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...
> 
> Don't forget that if you want to backport this patch, you also need at least
> to backport
> 
> https://codereview.qt-project.org/31089
> https://codereview.qt-project.org/31090
> and
> https://codereview.qt-project.org/34288

Yep, I'd ensure that everything is backported until the current state in Qt5 
is reached.

Bye
-- 
Milian Wolff
mail at milianw.de
http://milianw.de