Looping control toggle during transformation

[kkevlar]

The transformation commands are ctrl+(left or right click).
The loop toggle command is L.

The user may want to start a transformation (the nodes are currently being dragged) and then decide to toggle looping by pressing L. If they are still holding control (required to start the transformation and change nodesigma/height), the L keypress will be interepreted as Ctrl+L which is loadmodel. Giving a loadmodel command while a transformation is in progress will cause the tool to segfault.

Loadmodel (ctrl+L) remains in the tool to provide a means for a clean restart, but interferes with toggling looping mid-transformation.

This problem can be avoided by first releasing ctrl and then pressing L, and then resume holding Ctrl.