Blender Git Loki

NodeEditor: Connect Viewer To Socket Selection

Request from the Spring team. When compositing the CTRL-Shift Click on a
node cycles the viewnode with an output socket. When you have many
render layers you spend time cycling to the desired socket. This patch
allows the user to CTRL-Shift Click on a socket to connect directly to
that socket.

Reviewed By: brecht

Maniphest Tasks: T62785

Differential Revision: https://developer.blender.org/D4564