Select UV boundary

Add an operator to select the UV boundary loops. It would behave similar to the mesh select boundary loop (automatically change to edge selection mode and operate on UV selection).

Menu placement: Before operation:

After Operation:

Example 2:

Example 3:

It is usefull for easily selecting where to pin or mark seams. Also If you want to select multiple UV island borders just press A then select border, instead of alt + multiple left clicks around the each uv island, so also a huge timesaver.