fix remaining selection backspace bugs

src/main.odin

@@ -137,18 +137,20 @@ main :: proc() {
 				earliest_selection := get_selection_for_line(earliest_line[:], earliest.line)
 				remove_range(earliest_line, earliest_selection.start, earliest_selection.end)
 				if latest.line != earliest.line {
-					latest_line := &lines[latest.line]
+					latest_line := lines[latest.line]
 					latest_selection := get_selection_for_line(latest_line[:], latest.line)
 					append(earliest_line, string(latest_line[latest_selection.end:len(latest_line)]))
-					defer delete(latest_line^)
 					ordered_remove(&lines, latest.line)
-					cursor.line -= 1
+					delete(latest_line)
+					if selection.start.line < selection.end.line {
+						cursor.line -= 1
+					}
 					for i := earliest.line + 1; i < latest.line; i += 1 {
 						line_to_remove := lines[i]
 						defer delete(line_to_remove)
 						ordered_remove(&lines, i)
 						// NOTE(grant): Should we do this here?
-						if i < cursor.line {
+						if selection.start.line < selection.end.line {
 							cursor.line -= 1
 						}
 					}