The selection number. The selected regions are assigned numbers that correspond to how far the region is from the start of the text. The selected region closest to the beginning of the text region is assigned the number 0, etc. Note that adding, moving or deleting a selected region can change the numbering.
passes back the start position of the selected region
passes back the end position of (e.g. offset immediately past) the selected region
Return: a newly allocated string containing the selected text. Use g_free() to free the returned string.
Gets the text from the specified selection.