Revert "Performance: Remap multiple items in UI"

This reverts commit 948211679f2a0681421160be0d3b90f507bc0be7.
This commit introduced some regressions in the test suite.
As this change is a core part of blender Bastien and I decided to revert
it as the solution isn't clear and needs more investigation.

The following tests FAILED:
	 62 - blendfile_liblink (SEGFAULT)
	 63 - blendfile_library_overrides (SEGFAULT)

It fails in (id_us_ensure_real)

1 files changed, 0 insertions, 83 deletions

diff --git a/source/blender/blenkernel/intern/lib_id_remapper_test.cc b/source/blender/blenkernel/intern/lib_id_remapper_test.cc
deleted file mode 100644
index 594f64dac73..00000000000
--- a/source/blender/blenkernel/intern/lib_id_remapper_test.cc
+++ /dev/null
@@ -1,83 +0,0 @@
-/*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- *
- * The Original Code is Copyright (C) 2022 by Blender Foundation.
- */
-
-#include "testing/testing.h"
-
-#include "BKE_lib_remap.h"
-
-#include "BLI_string.h"
-
-#include "DNA_ID.h"
-
-namespace blender::bke::id::remapper::tests {
-
-TEST(lib_id_remapper, unavailable)
-{
-  ID id1;
-  ID *idp = &id1;
-
-  IDRemapper *remapper = BKE_id_remapper_create();
-  IDRemapperApplyResult result = BKE_id_remapper_apply(remapper, &idp, ID_REMAP_APPLY_DEFAULT);
-  EXPECT_EQ(result, ID_REMAP_RESULT_SOURCE_UNAVAILABLE);
-
-  BKE_id_remapper_free(remapper);
-}
-
-TEST(lib_id_remapper, not_mappable)
-{
-  ID *idp = nullptr;
-
-  IDRemapper *remapper = BKE_id_remapper_create();
-  IDRemapperApplyResult result = BKE_id_remapper_apply(remapper, &idp, ID_REMAP_APPLY_DEFAULT);
-  EXPECT_EQ(result, ID_REMAP_RESULT_SOURCE_NOT_MAPPABLE);
-
-  BKE_id_remapper_free(remapper);
-}
-
-TEST(lib_id_remapper, mapped)
-{
-  ID id1;
-  ID id2;
-  ID *idp = &id1;
-  BLI_strncpy(id1.name, "OB1", sizeof(id1.name));
-  BLI_strncpy(id2.name, "OB2", sizeof(id2.name));
-
-  IDRemapper *remapper = BKE_id_remapper_create();
-  BKE_id_remapper_add(remapper, &id1, &id2);
-  IDRemapperApplyResult result = BKE_id_remapper_apply(remapper, &idp, ID_REMAP_APPLY_DEFAULT);
-  EXPECT_EQ(result, ID_REMAP_RESULT_SOURCE_REMAPPED);
-  EXPECT_EQ(idp, &id2);
-
-  BKE_id_remapper_free(remapper);
-}
-
-TEST(lib_id_remapper, unassigned)
-{
-  ID id1;
-  ID *idp = &id1;
-
-  IDRemapper *remapper = BKE_id_remapper_create();
-  BKE_id_remapper_add(remapper, &id1, nullptr);
-  IDRemapperApplyResult result = BKE_id_remapper_apply(remapper, &idp, ID_REMAP_APPLY_DEFAULT);
-  EXPECT_EQ(result, ID_REMAP_RESULT_SOURCE_UNASSIGNED);
-  EXPECT_EQ(idp, nullptr);
-
-  BKE_id_remapper_free(remapper);
-}
-
-}  // namespace blender::bke::id::remapper::tests