Blender Git Loki

Fix T62101: GPencil: selection order is wrong

Following the advices of @Germano Cavalcante (mano-wii) , I have exposed as a workaround the free function to be called from draw manager for selection.

Now, the free function is not called for selection inside gpencil draw_scene, but it's called from draw_manager.c.

The real fix would be create a new Scene_finish callback in draw manager, but as the release of 2.80 is almost here, we fix this with a workaround that must be removed when new callback is in place.

Differential Revision: https://developer.blender.org/D5193