Additional property option to the pack islands operator.
####Related tasks
{ T78395}
####Starting point
Selected UV islands will be packed
Blue outline = original selection bounding box
{F8652072, height = 300}
####Undesired result
After packing, the selected uv islands overlap with other uv islands.
{F8652074, height = 300}
####Desired result
Selected uv islands are packed into the original selection bounding box.
{F8652076, height = 300}