quick operation

[super-diao]

Wish there was a more convenient operation (currently I am doing it, but the performance is poor) :

1. Select an area through the mouse box to implement copy and paste. The configurations of nodes and edges after replication are also retained, and the edge relationships are also retained.

2. There is a button somewhere in the interface. Click it to add a node.

3. When creating a connection, click the two nodes with the mouse. The one clicked first is the starting point and the one clicked later is the end point.

4. Click the node and edge, and the corresponding Properties are displayed on the right side, which can be edited (now only view).