Breeze style problem since Qt 6.8.2

[Albert Astals Cid]

El dimecres, 12 de març del 2025, a les 15:11:59 (Hora estàndard d’Europa 
central), Tobias Leupold va escriure:
> E-Mail von Jean-Baptiste Mardelle vom Dienstag, 11. März 2025, 11:16:
> > On Saturday, March 8, 2025 7:06:18 PM Central European Standard Time
> > Tobias
> > 
> > Leupold wrote:
> > > Hi all!
> > > 
> > > There's a style problem with Breeze that emerged with Qt 6.8.2:
> > > QSpinBoxes
> > > take too much vertical space if an application-wide style sheet is set.
> 
> Even
> 
> > > setting a single space as the style sheet already triggers this, it has
> > > nothing to do with a spinbox-specific style.
> > 
> > Hi!
> > 
> > For what it's worth, I am also seeing this problem in Kdenlive. Didn't
> > have
> > time to investigate, but I can confirm that setting any non empty style
> 
> sheet
> 
> > on a widget that contains a QSpinBox makes it use 1.5 - 2 times the
> > vertical space with Qt 6.8.2 anf KF 6.11 using Breeze style.
> 
> After all, it's nice to see I'm at least not the only one affected by this.
> It would be really, really nice if we could get this fixed -- one or
> another way.
> 
> This is really annoying -- and it doesn't seem like the Qt guys would be
> conscious of having done anything wrong and/or to be working too hard on
> tracking this down :-(

Can you bisect in which commit the behaviour was introduced?

Cheers,
  Albert

> 
> > Regards,
> > Jean-Baptiste
> > 
> > > This does not show up with Fusion. And also not in Breeze, as long as no
> > > application-wide style sheet is set. I suppose most KDE apps don't use
> > > application-wide styles, so not many devs may have already noticed this.
> > > However e.g. KPhotoAlbum is affected.
> > > 
> > > I first thought this was a Breeze bug. Along with some hints from the Qt
> > > 
> > > forum, I opened a respective bug report:
> > >     https://bugs.kde.org/show_bug.cgi?id=499906
> > > 
> > > However David Redondo said this should be an upstream Qt bug. So I filed
> 
> one
> 
> > > there:
> > >     https://bugreports.qt.io/browse/QTBUG-133845
> > > 
> > > ... where Christian Ehrlicher said he thinks it's a Breeze issue.
> > > 
> > > So ... now the cat is biting its own tail. I have never worked on style
> > > stuff before, so I don't know anything about this. Is anybody with more
> > > insight of this willing to have a look at that issue? So that we can
> 
> either
> 
> > > get this fixed in Breeze or in Qt or maybe in both?
> > > 
> > > Thanks in advance for all help on tracking this annoying issue down!
> > > 
> > > Cheers, Tobias