Hide Dock Icon in MacOS

[wfaulk]

Checklist:

• [x] I have checked that there are no issues with similar or the same content

  YOU SHOULD CHECK CLOSED ISSUES ASWELL

• [x] I have checked the FAQ (https://github.com/MarshallOfSound/Google-Play-Music-Desktop-Player-UNOFFICIAL-/wiki/FAQ) and the answer I am looking for is not there
• [x] I have double checked and can reproduce the issue

OS: MacOS X 10.13.6

GPMDP Version: 4.6.1

Issue Descriptions: It would be nice if there were an option to get rid of the Dock icon and only have the menulet interface.

Steps to Reproduce: n/a

[welcome[bot]]

👋 Thanks for opening your first issue here! If you're reporting a 🐞 bug, please make sure you include steps to reproduce it. We get a lot of duplicate issues on this repo, so please double check now that your issue has not already been solved or doesn't have an open issue already. To help make it easier for us to investigate your issue, please follow the contributing guidelines and ensure the issue template was filled out.

[wfaulk]

I was able to edit Info.plist manually and add this item:

    <key>LSUIElement</key>
    <true/>

and that prevents it from ever showing the Dock icon, and it seems to work fine that way. (Actually, I think it's preventing it from displaying song notifications. Also, this change seems to make the start-on-login feature think that the app is a command line application, and tries to open a terminal at login to start the app instead of just doing a normal application start.)

But it would be nice if there were a toggleable option in the app.

I do see that there is a "Minimize to Tray" option in the preferences, but I can't figure out what it does. It certainly doesn't prevent the Dock icon from showing, regardless of whether I close the main window or minimize it.