Implement gnome-shell's osd DBus interface
g-s-d uses this:
<interface name="org.gnome.Shell">
<method name="ShowOSD">
<arg type="a{sv}" direction="in" name="params"/>
</method>
</interface>
for on screen display.
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g-s-d uses this:
<interface name="org.gnome.Shell">
<method name="ShowOSD">
<arg type="a{sv}" direction="in" name="params"/>
</method>
</interface>
for on screen display.