fix issues toggling EDIT mode

1) it was throwing errors if object was linked

2) bim.override_mode_set_edit wasn't considering that toggle_edit_mode might not work out and was changing BIMGeometryProperties.mode though it wasn't needed.

src/blenderbim/blenderbim/bim/module/geometry/operator.py

@@ -1669,7 +1669,8 @@ class OverrideModeSetEdit(bpy.types.Operator):
             # The active object is non-mesh-like. Set a valid object (or None) as active
             context.view_layer.objects.active = context.selected_objects[0] if context.selected_objects else None
         if context.active_object:
-            tool.Blender.toggle_edit_mode(context)
+            if tool.Blender.toggle_edit_mode(context) == {"CANCELLED"}:
+                return {"CANCELLED"}
             context.scene.BIMGeometryProperties.is_changing_mode = True
             if context.scene.BIMGeometryProperties.mode != "EDIT":
                 context.scene.BIMGeometryProperties.mode = "EDIT"

src/blenderbim/blenderbim/tool/blender.py

@@ -694,6 +694,8 @@ class Blender(blenderbim.core.tool.Blender):
         ao = context.active_object
         if not ao:
             return {"CANCELLED"}
+        if ao.library:
+            return {"CANCELLED"}
         if ao.type in cls.OBJECT_TYPES_THAT_SUPPORT_EDIT_MODE:
             return bpy.ops.object.mode_set(mode="EDIT", toggle=True)
         elif ao.type in cls.OBJECT_TYPES_THAT_SUPPORT_EDIT_GPENCIL_MODE: