Linux – How to show KeePass2 tray icon in Xfce

• /etc/fonts hold Xft settings, while .fonts.conf is a per-user override of /etc/fonts/*
• DEs set their settings using X settings daemon (there are several of them, one in each DE, and also several standalone for use with lightweight WMs)
• applications get settings either from Xft directly (/etc/fonts), or from X settings daemon if it is active.
• some applications (e.g. Google Chrome) only get settings from X settings daemon. so the only way to get proper fonts in Chrome running under lightweight WM is to run some sort of xsettingsd
• gtk and qt apps treat some of Xft settings differently, so it can be tricky to create fonts.conf that works in the same way in Qt and GTK.

and here's what i think, but didn't really check:

• GDK/Pango uses Xft with its default settings, either from fonts.conf or X settings.
• Qt adds extra tweaks to fonts.conf settings, which breaks some of the settings.
• Cairo seems to respect xft settings, but rendering looks slightly differently compared to Pango.

kdocker ... it also does not appear to be able to iconify a window when closed (it actually closed instead).

As far as I understand no docker can do that. This has to be supported by the application (e.g. claws, vlc, etc). When you click on close the window manager signals the application to close, depending on its setup it closes or minimises to tray.

What I want to iconify is xfce4-terminal, so any terminal which can iconify itself and works with xfce would be ok as a solution, too.

I don't have an exact solution to this, but in terms of how it appears in window or Alt-Tab lists its identical. You could use a drop down terminal like guake. It lets you define a hotkey that will make the terminal appear and disappear. You can also add some window events as triggers for it to disappear (e.g. some other window raises itself). You can also configure other how and where it appears, what size it has. I like the fact that the terminal is always at the same place no matter when I call it and its always running at login.

The only missing feature I have found is, I can't control which display it appears on for dual display setups; it always uses the left most display.