getSelectionBounds
Returns true if some text is selected; places the bounds of the selection in @start and @end.
If the selection has length 0, then @start and @end are filled in with the same value. @start and @end will be in ascending order. If @start and @end are null, then they are not filled in, but the return value still indicates whether text is selected.
Return
whether the selection has nonzero length
Parameters
start
iterator to initialize with selection start
end
iterator to initialize with selection end