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I'm author of a couple off apps that make use of systray. Recently, since in some desktops only the indicator is supported (see ubuntu unity), I introduced a check and if indicator is supported the app uses indicator in place of systray.

    import appindicator
except: HAS_APPINDICATOR = False

which works pretty good, the problem is that I still would like to use systray in place of indicator if systray is supported. Is there a way to understand if systray is supported/not blocked from the current desktop environment?

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