Returns the bounds of the selection in a text-input-pane.
The function text-input-pane-selection returns as multiple values the bounding indexes of the selection in pane . That is, start is the inclusive index of the first selected character, and end is one greater than the index of the last selected character. If there is no selection, then both start and end are the caret position in pane .
set-text-input-pane-selection
text-input-pane
text-input-pane-selected-text
text-input-pane-selection-p