Function gdk::selection_owner_get
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Determines the owner of the given selection.
selection
an atom indentifying a selection.
Returns
if there is a selection owner
for this window, and it is a window known to the current process,
the Window that owns the selection, otherwise None. Note
that the return value may be owned by a different process if a
foreign window was previously created for that window, but a new
foreign window will never be created by this call.