Set Pulseaudio properties

See #3832

(cherry picked from commit 7d38816310)

qutebrowser/app.py

@@ -144,6 +144,7 @@ def init(*, args: argparse.Namespace) -> None:
     quitter.instance.shutting_down.connect(QApplication.closeAllWindows)
 
     _init_icon()
+    _init_pulseaudio()
 
     loader.init()
     loader.load_components()
@@ -188,6 +189,12 @@ def _init_icon():
         q_app.setWindowIcon(icon)
 
 
+def _init_pulseaudio():
+    """Set properties for PulseAudio."""
+    for prop in ['application.name', 'application.icon_name']:
+        os.environ['PULSE_PROP_OVERRIDE_' + prop] = 'qutebrowser'
+
+
 def _process_args(args):
     """Open startpage etc. and process commandline args."""
     if not args.override_restore: