Index: trunk/src/rats_patch.c
===================================================================
--- trunk/src/rats_patch.c	(revision 36738)
+++ trunk/src/rats_patch.c	(revision 36739)
@@ -2,7 +2,7 @@
  *                            COPYRIGHT
  *
  *  pcb-rnd, interactive printed circuit board design
- *  Copyright (C) 2015..2020 Tibor 'Igor2' Palinkas
+ *  Copyright (C) 2015..2022 Tibor 'Igor2' Palinkas
  *
  *  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
@@ -43,6 +43,7 @@
 #include "undo.h"
 #include "conf_core.h"
 #include "netlist.h"
+#include "event.h"
 
 static void rats_patch_remove(pcb_board_t *pcb, pcb_ratspatch_line_t * n, int do_free);
 
@@ -327,6 +328,12 @@
 		pcb_ratspatch_apply(pcb, n);
 }
 
+int pcb_rats_patch_cleanup_patches(pcb_board_t *pcb)
+{
+	rnd_trace("RP clean\n");
+	return 0;
+}
+
 int pcb_rats_patch_export(pcb_board_t *pcb, pcb_ratspatch_line_t *pat, rnd_bool need_info_lines, void (*cb)(void *ctx, pcb_rats_patch_export_ev_t ev, const char *netn, const char *key, const char *val), void *ctx)
 {
 	pcb_ratspatch_line_t *n;
@@ -635,9 +642,16 @@
 	{"SavePatch", pcb_act_SavePatch, pcb_acth_SavePatch, pcb_acts_SavePatch}
 };
 
+static void rats_patch_netlist_chg(rnd_hidlib_t *hidlib, void *user_data, int argc, rnd_event_arg_t argv[])
+{
+	pcb_rats_patch_cleanup_patches((pcb_board_t *)hidlib);
+}
+
+
 void pcb_rats_patch_init2(void)
 {
 	RND_REGISTER_ACTIONS(rats_patch_action_list, NULL);
+	rnd_event_bind(PCB_EVENT_NETLIST_CHANGED, rats_patch_netlist_chg, NULL, core_ratspatch_cookie);
 }
 
 
Index: trunk/src/rats_patch.h
===================================================================
--- trunk/src/rats_patch.h	(revision 36738)
+++ trunk/src/rats_patch.h	(revision 36739)
@@ -2,7 +2,7 @@
  *                            COPYRIGHT
  *
  *  pcb-rnd, interactive printed circuit board design
- *  Copyright (C) 2013..2015 Tibor 'Igor2' Palinkas
+ *  Copyright (C) 2013..2022 Tibor 'Igor2' Palinkas
  *
  *  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
@@ -71,6 +71,11 @@
 /* apply a single patch record on [PCB_NETLIST_EDITED]; returns non-zero on failure */
 int pcb_ratspatch_apply(pcb_board_t *pcb, pcb_ratspatch_line_t * patch);
 
+/* Clean up rats patch list: remove entries that are already solved on the
+   input netlist. Returns number of entries removed or -1 on error. */
+int pcb_rats_patch_cleanup_patches(pcb_board_t *pcb);
+
+
 /**** exporter ****/
 
 /* Special text exporter: