Ticket #5603: Working plane not reset under Arch when making new project

[Kunda1]

issue #1823: Working plane not reset under Arch when making new project
Discussion thread

New ticket in GH issue #5603

[Kunda1]

New proposal per @yorik in https://github.com/FreeCAD/FreeCAD/issu ... 1126175296

New proposal: implementing per-document working plane

• The grid system is already per view, so each view can display a different grid already.
• The python interface should stays the same. You just get and set the working plane and shouldn't worry about anything else
• Two possibilities: 1) FreeCAD.DraftWorkingPlane still give you the current working plane of the document. On switching documents, this value gets changed. A doc observer changes the value each time the active doc is changed or 2) FreeCAD.DraftWorkingPlane is replaced with Draft.getWorkingPlane() which does all the work. I favour 2) but it will break some workbenches
• The working plane data can be stringified and saved to document meta
• Draft.getWorkingPlane() always reads from the document meta