Add "Extend Left/Right" options to the Rectangle drawing object

Request to add Extend options to the rectangle drawing object:
-Extend rectangle to the left
-Extend rectangle to the right

It should extend into infinity or when extended to the right side it should be locked to the last/current candle.
Locking to the last/current candle has the advantage that the rectangle wouldn't overlap any fixed market profiles that are locked to the right side and it just looks more clean.