Setting the default terminal app

[KucharczykL]

Hi, I was looking into setting the default terminal on KDE. This topic of default apps was partially discussed in #406. However, a terminal app does not have any associated MIME type and thus no way of being set using mimeapps.list.

Seems there's a cross-distro solution proposed in https://gitlab.freedesktop.org/xdg/xdg-specs/-/merge_requests/46 but it's not accepted/implemented yet.

As a result, it seems that in KDE the only way to set a default terminal app (that's respected, for example, in Dolphin's menu item "Open terminal here") is setting TerminalApplication in ~/.config/kdeglobals. If you set the default terminal via Settings it also sets TerminalService to the terminal's desktop file but I am not sure what purpose it serves.

Example kdeglobals settings:

[General]
TerminalApplication=kitty
TerminalService=kitty.desktop