If dragging a 3D object into scene causes new import to be added, toolstate resets to default instead of inheriting the existing toolstate

This happens e.g. when project has QtQuick 2.12 import and dragging a View3D adds QtQuick 2.15 import. This triggers qmlpuppet restart, which resets the toolstate to default.

Empty scene toolstate is stored, but that state is never initialized to edit view. Therefore the default state ends up being used as initial state for the scene.