Breeze style problem since Qt 6.8.2

[Tobias Leupold]

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.

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