Add to scene properties whether we use relative path to .ifc #3251

Previously it was stored as operator's prop which is (turned out) reseted on reopening .blend.

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

@@ -840,13 +840,16 @@ class ExportIFC(bpy.types.Operator):
         return {"RUNNING_MODAL"}
 
     def execute(self, context):
-        if context.scene.BIMProjectProperties.should_disable_undo_on_save:
+        project_props = context.scene.BIMProjectProperties
+        if self.should_save_as:
+            project_props.use_relative_project_path = self.use_relative_path
+        if project_props.should_disable_undo_on_save:
             old_history_size = tool.Ifc.get().history_size
             old_undo_steps = context.preferences.edit.undo_steps
             tool.Ifc.get().history_size = 0
             context.preferences.edit.undo_steps = 0
         IfcStore.execute_ifc_operator(self, context)
-        if context.scene.BIMProjectProperties.should_disable_undo_on_save:
+        if project_props.should_disable_undo_on_save:
             tool.Ifc.get().history_size = old_history_size
             context.preferences.edit.undo_steps = old_undo_steps
         return {"FINISHED"}
@@ -883,7 +886,7 @@ class ExportIFC(bpy.types.Operator):
         if not scene.DocProperties.ifc_files:
             new = scene.DocProperties.ifc_files.add()
             new.name = output_file
-        if self.use_relative_path and bpy.data.is_saved:
+        if context.scene.BIMProjectProperties.use_relative_project_path and bpy.data.is_saved:
             output_file = os.path.relpath(output_file, bpy.path.abspath("//"))
         if scene.BIMProperties.ifc_file != output_file and extension not in ["ifczip", "ifcjson"]:
             scene.BIMProperties.ifc_file = output_file

src/blenderbim/blenderbim/bim/module/project/prop.py

@@ -165,6 +165,7 @@ class BIMProjectProperties(PropertyGroup):
     active_link_index: IntProperty(name="Active Link Index")
     export_schema: EnumProperty(items=get_export_schema, name="IFC Schema")
     template_file: EnumProperty(items=get_template_file, name="Template File")
+    use_relative_project_path: BoolProperty(name="Use Relative Project Path", default=False)
 
     def get_library_element_index(self, lib_element):
         return next((i for i in range(len(self.library_elements)) if self.library_elements[i] == lib_element))