I moved to 17.04 recently, which introduced the move to gtk 3. This has some impact on QT applications. Such as seafile-applet
When i have dark theme in 17.04, the seafile gui colors do not match my theme, and some of the txt is blacked out. I can fix this with changing
Exec=seafile-applet -style=gtk in
/usr/share/applications/seafile.desktop, which is just a work around to getting the basic, white theme on the gui.
It would be nice if seafile-applet was moved to gtk3, or at least be able to configure the themes from the settings.