Created attachment 113984 [details] Screenshot Screenshot demonstrates the legibility issues with the GTK2+ theme via deluge 1.3.15 on kubuntu 18.04.
Same bug on Arch Linux, plasma 5.13.4, when I set breeze-gtk as theme for gtk2 apps. Deluge version is 1.3.15.
I can't reproduce with Deluge 2.0.3. Operating System: Arch Linux KDE Plasma Version: 5.16.2 KDE Frameworks Version: 5.59.0 Qt Version: 5.12.4
Let's call it fixed in Deluge or with a Breeze GTK change then. :)