Scene context detection

[tomvanmele]

def detect_current_context():
    """Chooses an appropriate context depending on available contexts and open instances. with the following priority:
    1. Viewer
    2. Plotter
    3. Rhino / GH - checked explicitly since SceneObjects for both get registered when code is run from either.
    4. Other

    Returns
    -------
    str
        Name of an available context, used as key in :attr:`SceneObject.ITEM_SCENEOBJECT`

    """

    if compas.is_grasshopper():
        return "Grasshopper"
    if compas.is_rhino():
        return "Rhino"
    if compas.is_blender():
        return "Blender"
    other_contexts = [v for v in ITEM_SCENEOBJECT.keys()]
    if other_contexts:
        return other_contexts[0]

    return None

The context detection code defaults to the first context found in ITEM_SCENEOBJECT when it is not detected to be one of Blender, Grasshopper, Rhino. Currently, on my system this is "Viewer", but the reason for this is random.

To Reproduce

scene = Scene()
meshobj = scene.add(mesh)

The type of meshobj will be the one registered for the viewer.

Expected behavior

The default context should be None, and the type of meshobj should be the base type.