Returns true if there is selected text in a text-input-pane.
The function text-input-pane-selection-p
returns t
if there is a selected region in
pane
and nil
otherwise.
set-text-input-pane-selection
text-input-pane
text-input-pane-selected-text
text-input-pane-selection
CAPI User Guide and Reference Manual (Unix version) - 3 Aug 2017