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Created attachment 1516026 [details]
Picture showing corrupted fonts and tabs

Description of problem:
I installed Netbeans 8.2 in RHEL 8 beta and noticed that the GTK+ theme didn't work as expected.  Tabs and fonts on docked windows (left and bottom) were sized incorrectly, and the fonts overall were not quite right.  Only the GTK+ theme is broken, all the default themes work fine.  See attached pic.

Version-Release number of selected component (if applicable):
gtk3-3.22.30-1.el8.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Install java & Netbeans 8.2 
2. Select the GTK+ theme
3.

Actual results:
Tabs and fonts broken on docked windows using the GTK+ theme.

Expected results:
GTK+ theme should work like the other themes.

Additional info:
The GTK+ theme works fine on CentOS 7.5 & 7.6, and works on Fedora 28 & 29.

I marked this as low severity because right now it may only be a problem if you install 3rd party apps.  However I can see this becoming a bigger issue when EPEL becomes available for RHEL 8 and people start installing IDEs and so on.

I replaced Oracle's NetBeans 8.2 with the latest Apache "incubating" NetBeans 10.0 and I am no longer seeing this issue with the GTK+ theme.

netbeans is not a GTK application. There is very little GTK can do to address the problem that occurs when 3rd party applications are using parts of GTK theme information for their own rendering.