Always clear 'fake user' flag from linked data.
Using this flag from linked data is always a double-edge sword, in one end some user have been relying on it to keep around data that is not really used as ID (like e.g. text data-blocks, node trees, see e.g. #103687, #105687). On the other end, it often causes over-keeping of linked data reference in production files. From now on, when an unused linked data is to be kept around, users should create an ID property to reference it. Implements #106321. Pull Request: https://projects.blender.org/blender/blender/pulls/111042
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@ -2061,6 +2061,10 @@ static void direct_link_id_common(
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}
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id->lib = current_library;
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if (id->lib) {
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/* Always fully clear fake user flag for linked data. */
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id->flag &= ~LIB_FAKEUSER;
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}
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id->us = ID_FAKE_USERS(id);
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id->icon_id = 0;
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id->newid = nullptr; /* Needed because .blend may have been saved with crap value here... */
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@ -1225,16 +1225,6 @@ static bool write_file_handle(Main *mainvar,
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* asap afterward. */
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id_lib_extern(id_iter);
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}
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else if (ID_FAKE_USERS(id_iter) > 0 && id_iter->asset_data == nullptr) {
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/* Even though fake user is not directly editable by the user on linked data, it is a
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* common 'work-around' to set it in library files on data-blocks that need to be linked
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* but typically do not have an actual real user (e.g. texts, etc.).
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* See e.g. #105687 and #103867.
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*
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* Would be good to find a better solution, but for now consider these as directly linked
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* as well. */
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id_lib_extern(id_iter);
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}
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else {
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id_iter->tag |= LIB_TAG_INDIRECT;
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id_iter->tag &= ~LIB_TAG_EXTERN;
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@ -115,10 +115,11 @@ class TestIdRuntimeTag(TestHelper):
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assert linked_material.is_library_indirect is False
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link_dir = os.path.join(output_lib_path, "Mesh")
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bpy.ops.wm.link(directory=link_dir, filename="LibMesh")
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bpy.ops.wm.link(directory=link_dir, filename="LibMesh", instance_object_data=False)
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linked_mesh = bpy.data.meshes['LibMesh']
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assert linked_mesh.is_library_indirect is False
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assert linked_mesh.use_fake_user is False
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obj.data = linked_mesh
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obj.material_slots[0].link = 'OBJECT'
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@ -131,17 +132,15 @@ class TestIdRuntimeTag(TestHelper):
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# so writing .blend file will have properly reset its tag to indirectly linked data.
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assert linked_material.is_library_indirect
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# Only usage of this linked mesh is a runtime ID (object), but it is flagged as 'fake user' in its library,
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# so writing .blend file will have kept its tag to directly linked data.
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assert not linked_mesh.is_library_indirect
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# Only usage of this linked mesh is a runtime ID (object),
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# so writing .blend file will have properly reset its tag to indirectly linked data.
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assert linked_mesh.is_library_indirect
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bpy.ops.wm.open_mainfile(filepath=output_work_path, load_ui=False)
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assert 'Cube' not in bpy.data.objects
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assert 'LibMaterial' in bpy.data.materials # Pulled-in by the linked mesh.
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linked_mesh = bpy.data.meshes['LibMesh']
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assert linked_mesh.use_fake_user is True
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assert linked_mesh.is_library_indirect is False
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assert 'LibMaterial' not in bpy.data.materials
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assert 'libMesh' not in bpy.data.meshes
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TESTS = (
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@ -214,9 +214,9 @@ class TestBlendLibLinkIndirect(TestBlendLibLinkHelper):
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material = bpy.data.materials[0]
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assert material.library is not None
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assert material.use_fake_user is True
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assert material.users == 2 # Fake user is not cleared when linking.
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assert material.is_library_indirect
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assert material.use_fake_user is False # Fake user is cleared when linking.
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assert material.users == 1
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assert material.is_library_indirect is True
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assert mesh.library is not None
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assert mesh.use_fake_user is False
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@ -229,29 +229,28 @@ class TestBlendLibLinkIndirect(TestBlendLibLinkHelper):
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coll.objects.link(ob)
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bpy.context.scene.collection.children.link(coll)
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assert material.users == 2
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assert material.is_library_indirect
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assert material.users == 1
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assert material.is_library_indirect is True
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assert mesh.users == 1
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assert mesh.is_library_indirect is False
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ob.material_slots[0].link = 'OBJECT'
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ob.material_slots[0].material = material
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assert material.users == 3
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assert material.users == 2
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assert material.is_library_indirect is False
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ob.material_slots[0].material = None
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assert material.users == 2
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assert material.users == 1
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# This is not properly updated whene removing a local user of linked data.
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assert material.is_library_indirect is False
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output_work_path = os.path.join(output_dir, self.unique_blendfile_name("blendfile"))
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bpy.ops.wm.save_as_mainfile(filepath=output_work_path, check_existing=False, compress=False)
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assert material.users == 2
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# Currently linked data with 'fake user' set are considered as directly linked data.
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assert not material.is_library_indirect
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assert material.users == 1
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assert material.is_library_indirect is True
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bpy.ops.wm.open_mainfile(filepath=output_work_path, load_ui=False)
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@ -264,10 +263,9 @@ class TestBlendLibLinkIndirect(TestBlendLibLinkHelper):
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material = bpy.data.materials[0]
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assert material.library is not None
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assert material.use_fake_user is True
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assert material.users == 2 # Fake user is not cleared when linking.
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# Currently linked data with 'fake user' set are considered as directly linked data.
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assert not material.is_library_indirect
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assert material.use_fake_user is False # Fake user is cleared when linking.
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assert material.users == 1
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assert material.is_library_indirect is True
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assert mesh.library is not None
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assert mesh.use_fake_user is False
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@ -293,7 +291,7 @@ class TestBlendLibAppendBasic(TestBlendLibLinkHelper):
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assert len(bpy.data.materials) == 1
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assert bpy.data.materials[0].library is not None
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assert bpy.data.materials[0].users == 2 # Fake user is not cleared when linking.
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assert bpy.data.materials[0].users == 1 # Fake user is cleared when linking.
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assert len(bpy.data.meshes) == 1
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assert bpy.data.meshes[0].library is None
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assert bpy.data.meshes[0].use_fake_user is False
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@ -310,7 +308,7 @@ class TestBlendLibAppendBasic(TestBlendLibLinkHelper):
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assert len(bpy.data.materials) == 1
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assert bpy.data.materials[0].library is not None
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assert bpy.data.materials[0].users == 2 # Fake user is not cleared when linking.
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assert bpy.data.materials[0].users == 1 # Fake user is cleared when linking.
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assert len(bpy.data.meshes) == 1
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assert bpy.data.meshes[0].library is None
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assert bpy.data.meshes[0].use_fake_user is False
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@ -328,7 +326,7 @@ class TestBlendLibAppendBasic(TestBlendLibLinkHelper):
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assert len(bpy.data.materials) == 1
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assert bpy.data.materials[0].library is not None
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assert bpy.data.materials[0].users == 2 # Fake user is not cleared when linking.
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assert bpy.data.materials[0].users == 1 # Fake user is cleared when linking.
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assert len(bpy.data.meshes) == 1
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assert bpy.data.meshes[0].library is None
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assert bpy.data.meshes[0].use_fake_user is True
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@ -345,7 +343,7 @@ class TestBlendLibAppendBasic(TestBlendLibLinkHelper):
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assert len(bpy.data.materials) == 1
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assert bpy.data.materials[0].library is not None
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assert bpy.data.materials[0].users == 2 # Fake user is not cleared when linking.
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assert bpy.data.materials[0].users == 1 # Fake user is cleared when linking.
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assert len(bpy.data.meshes) == 1
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assert bpy.data.meshes[0].library is None
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assert bpy.data.meshes[0].users == 1
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