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, 11 insertions, 5 deletions

diff --git a/source/blender/editors/space_sequencer/space_sequencer.c b/source/blender/editors/space_sequencer/space_sequencer.c
index b294fdf4820..b93f421ff5c 100644
--- a/source/blender/editors/space_sequencer/space_sequencer.c
+++ b/source/blender/editors/space_sequencer/space_sequencer.c
@@ -39,7 +39,6 @@
 #include "BKE_context.h"
 #include "BKE_global.h"
 #include "BKE_lib_id.h"
-#include "BKE_lib_remap.h"
 #include "BKE_screen.h"
 #include "BKE_sequencer_offscreen.h"
 
@@ -989,12 +988,19 @@ static void sequencer_buttons_region_listener(const wmRegionListenerParams *para
   }
 }
 
-static void sequencer_id_remap(ScrArea *UNUSED(area),
-                               SpaceLink *slink,
-                               const struct IDRemapper *mappings)
+static void sequencer_id_remap(ScrArea *UNUSED(area), SpaceLink *slink, ID *old_id, ID *new_id)
 {
   SpaceSeq *sseq = (SpaceSeq *)slink;
-  BKE_id_remapper_apply(mappings, (ID **)&sseq->gpd, ID_REMAP_APPLY_DEFAULT);
+
+  if (!ELEM(GS(old_id->name), ID_GD)) {
+    return;
+  }
+
+  if ((ID *)sseq->gpd == old_id) {
+    sseq->gpd = (bGPdata *)new_id;
+    id_us_min(old_id);
+    id_us_plus(new_id);
+  }
 }
 
 /* ************************************* */