feat: Command line flag for toggling minimise to tray

[alterNERDtive]

Is your feature request related to a problem? Please describe.

Running cantata with the application already running and minimised to tray opens the application window.

Essentially I have a hotkey set to that. To close it / minimise it to tray, I cannot simply hit the same hotkey again; i have to close the window or click the tray icon.

Describe the solution you'd like

I would like to see some way to minimise the application to the tray via command line argument.

Ideally there would be e.g. a --minimise and a --toggle flag for minimising and for toggling the state, respectively.

Describe alternatives you've considered

I cannot really think of any that do not introduce additional friction. Maybe a setting that minimises the application to tray when it loses focus.

An application hotkey for minimise / close window (not quit!) would accomplish the same thing; but I prefer defining all my key binds / shortcuts on the window manager level.

Additional context

n/a

[maxmitti]

I may have found a possible alternative which could be implemented in a script.
You can programmatically trigger the “Click on Tray Icon” via D-Bus, which basically toggles the show/hide state of Cantata.

I found the following on KDE Plasma using QDBusViewer:

1. On the session bus there is the org.kde.StatusNotifierWatcher service with the property StatusNotifierWatcher/org.kde.StatusNotifierWatcher/RegisteredStatusNotifierItems which is a list of D-Bus services of all tray icons currently using this interface.
2. By going through the list entries it is possible to find Cantata based on the StatusNotifierItem/org.kde.StatusNotifierItem/Title property.
3. On the service corresponding to Cantata a call to the StatusNotifierItem/org.kde.StatusNotifierItem/Activate method with arbitrary x and y values toggles the show/hide state.