Hello,

i wonder how to add a badge for unreded messages/notifications to the taskbar-icon of my program.

Messenger like WhatsApp or Skype have this option and for Thunderbird there are Addons for that.
Because of the red circle badge of WhatsApp for example is overlapping the normal 24x24px icon i am sure its no switching of the current icon it should be an function for an overlay.
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Maybe you know how the other programs are doing this.

Thank you very much in advance!