QTreeVeiw line spacing in KDE Plasma 5.10.4 for KDE and Qt applications is too big (not normal) comparing to other DE. 2 programs screenshots attached: QuiteRSS and Akregator in KDE and MATE (looks normal here) respectively. As You can see below QTreeVeiw or news list in KDE takes about 1.5 times more vertical space than in MATE. Any way to fix this sparsed style or report a bug?

The spacing there is defined by the Widget Style. In Plasma the default style is Breeze. In GTK-based environments the default is to match the current GTK theme. You can change the style used in Plasma in System Settings -> Application Appearance -> Style.
Some of the styles allow you to tweak some of those parameters in their config dialogs, but I don't think Breeze allows you to tweak the spacing of the tree view items.

If you are up to modifying c++ source files, you can get the Breeze source, edit the source to adjust the spacing, recompile and install.

It is a bug: https://bugs.kde.org/show_bug.cgi?id=371489
Hope just need to fix CSS, not need to recompile.

It's not a bug -- as stated in that report, this look is intentional. If you don't like it, I think your current best bet is to use a different widget style.

scummos wrote:It's not a bug -- as stated in that report, this look is intentional. If you don't like it, I think your current best bet is to use a different widget style.

Do not see other suitable styles in Neon package: Fusion has VERY small controls (radio, check buttons, etc) - seems does not have Hi/Low DPI support. And this is definitelly a bug as mentioned above: https://bugs.kde.org/show_bug.cgi?id=371489

This is not a bug. The report says

We are aware of the complain about breeze being too space consuming (although in general one does get use to it). There are plans to have a "compact" breeze mode.

which acknowledges that some people want it and it might be implemented as an alternative in the future, but the current behaviour is fully intentional.

As for other styles, I'm pretty sure QtCurve should be in the repos, possibly also Kvantum (if not, you can get instructions here: https://store.kde.org/p/1005410/).

airdrik wrote:As for other styles, I'm pretty sure QtCurve should be in the repos, possibly also Kvantum (if not, you can get instructions here: https://store.kde.org/p/1005410/).

QtCurve is in Kubuntu repo, not in Neon, can't install it cause it depend on qt 5.6.1. Is there some additional repo in neon for xenia with styles, applications, etc?