Adding Nodes from Presets panel differs from the other panels

Created by: Ribel78

Problem statement

Created node groups and nodes in Presets panel in Tool shelf after clicking are added to some predefined location as opposed to the nodes on other panels which are in grab mode and move with the mouse.

Steps to reproduce

1. Click on the node or node group in the Presets panel - the nodes are added to the node workspace but don't move with the mouse.
2. Click on node from any other nodes panel - the nodes are added to the work space but are not released yet from the mouse.

Expected result

Nodes created through Presets panel should be in grab mode and move under the mouse pointer.

Actual result

Nodes are placed always in predefined location which can be outside the current node view. Still they are selected so if the user has enabled Continuous Grab mode by pressing G can move the node even if it is not in the view. It could be a problem if a group node is added on top of existing node tree and accidentally deselected.

Sverchok version

SV 0.5.9.6 (b546794c)