advertise tray capability

[allefeld]

I fiddled around for ages with kdocker to put signal desktop into the tray.
Now I found by chance the --use-tray-icon command line option.

This capability is extremely useful, but as far as I can see it not advertised at all.

• It is not exposed through the in-app settings (File / Preferences).
• There is no item in the Help menu that lists the options.
• signal-desktop --help doesn't work.
• man signal-desktop doesn't work.

Are there any other useful options I should know about? ;)

• I have searched open and closed issues for duplicates

This is related to #3518, but isn't identical since most programs expose their tray capabilities also through an in-app setting. I support #3518 since documenting command line options would be good in general, but this also could/should be a setting.

Signal Version: 1.27.3

Operating System: Debian 10 "buster"

Linked Device Version: not relevant

[scottnonnenberg-signal]

The feature is still in beta. Thanks for trying it out!

This issue tracks promoting to a full production feature, in the settings screen: #2210