Gets the text from the specified selection.
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 starting character offset of the selected region
passes back the ending character offset (offset immediately past) of the selected region
a newly allocated string containing the selected text. Use g_free() to free the returned string.