source/blender/editors/include/ED_screen.h

@@ -699,6 +699,13 @@ ARegion *ED_area_find_region_xy_visual(const ScrArea *area, int regiontype, cons
 struct ARegionType *ED_area_type_hud(int space_type);
 void ED_area_type_hud_clear(struct wmWindowManager *wm, ScrArea *area_keep);
 void ED_area_type_hud_ensure(struct bContext *C, struct ScrArea *area);
+/**
+ * Lookup the region the operation was executed in, and which should be used to redo the
+ * operation. The lookup is based on the region type, so it can return a different region when the
+ * same region type is present multiple times.
+ */
+ARegion *ED_area_type_hud_redo_region_find(const struct ScrArea *area,
+                                           const struct ARegion *hud_region);
 
 /**
  * Default key-maps, bit-flags (matches order of evaluation).

source/blender/editors/interface/interface_region_hud.cc

@@ -385,4 +385,16 @@ void ED_area_type_hud_ensure(bContext *C, ScrArea *area)
   region->visible = !((region->flag & RGN_FLAG_HIDDEN) || (region->flag & RGN_FLAG_TOO_SMALL));
 }
 
+ARegion *ED_area_type_hud_redo_region_find(const ScrArea *area, const ARegion *hud_region)
+{
+  BLI_assert(hud_region->regiontype == RGN_TYPE_HUD);
+  HudRegionData *hrd = static_cast<HudRegionData *>(hud_region->regiondata);
+
+  if (hrd->regionid == -1) {
+    return nullptr;
+  }
+
+  return BKE_area_find_region_type(area, hrd->regionid);
+}
+
 /** \} */

source/blender/editors/undo/ed_undo.cc

@@ -668,14 +668,21 @@ int ED_undo_operator_repeat(bContext *C, wmOperator *op)
   if (op) {
     CLOG_INFO(&LOG, 1, "idname='%s'", op->type->idname);
     wmWindowManager *wm = CTX_wm_manager(C);
+    const ScrArea *area = CTX_wm_area(C);
     Scene *scene = CTX_data_scene(C);
 
     /* keep in sync with logic in view3d_panel_operator_redo() */
     ARegion *region_orig = CTX_wm_region(C);
-    ARegion *region_win = BKE_area_find_region_active_win(CTX_wm_area(C));
+    /* If the redo is called from a HUD, this knows about the region type the operator was
+     * initially called in, so attempt to restore that. */
+    ARegion *redo_region_from_hud = (region_orig->regiontype == RGN_TYPE_HUD) ?
+                                        ED_area_type_hud_redo_region_find(area, region_orig) :
+                                        nullptr;
+    ARegion *region_repeat = redo_region_from_hud ? redo_region_from_hud :
+                                                    BKE_area_find_region_active_win(area);
 
-    if (region_win) {
-      CTX_wm_region_set(C, region_win);
+    if (region_repeat) {
+      CTX_wm_region_set(C, region_repeat);
     }
 
     if (WM_operator_repeat_check(C, op) && WM_operator_poll(C, op->type) &&