Index: trunk/src/gui_act.c
===================================================================
--- trunk/src/gui_act.c	(revision 29681)
+++ trunk/src/gui_act.c	(revision 29682)
@@ -856,7 +856,7 @@
 		gid = pcb_layergrp_id(PCB, g);
 	}
 
-	PCB_ACT_IRES(pcb_layergrp_del(PCB, gid, 1));
+	PCB_ACT_IRES(pcb_layergrp_del(PCB, gid, 1, 1));
 	return 0;
 }
 
Index: trunk/src/layer.c
===================================================================
--- trunk/src/layer.c	(revision 29681)
+++ trunk/src/layer.c	(revision 29682)
@@ -1013,7 +1013,7 @@
 }
 
 
-int pcb_layer_move(pcb_board_t *pcb, pcb_layer_id_t old_index, pcb_layer_id_t new_index, pcb_layergrp_id_t new_in_grp)
+int pcb_layer_move(pcb_board_t *pcb, pcb_layer_id_t old_index, pcb_layer_id_t new_index, pcb_layergrp_id_t new_in_grp, pcb_bool undoable)
 {
 	/* sanity checks */
 	if (old_index < -1 || old_index >= pcb->Data->LayerN) {
@@ -1038,9 +1038,9 @@
 
 
 	if (old_index == -1) /* append new layer at the end of the logical layer list, put it in the current group */
-		return pcb_layer_move_append(pcb, new_index, new_in_grp, 1);
+		return pcb_layer_move_append(pcb, new_index, new_in_grp, undoable);
 	if (new_index == -1) /* Delete the layer at old_index */
-		return pcb_layer_move_delete(pcb, old_index, 1);
+		return pcb_layer_move_delete(pcb, old_index, undoable);
 
 
 	pcb_message(PCB_MSG_ERROR, "Logical layer move is not supported any more. This function should have not been called. Please report this error.\n");
Index: trunk/src/layer.h
===================================================================
--- trunk/src/layer.h	(revision 29681)
+++ trunk/src/layer.h	(revision 29682)
@@ -295,7 +295,7 @@
 /* index is 0..PCB_MAX_LAYER-1.  If old_index is -1, a new layer is
    inserted at that index.  If new_index is -1, the specified layer is
    deleted.  Returns non-zero on error, zero if OK.  */
-int pcb_layer_move(pcb_board_t *pcb, pcb_layer_id_t old_index, pcb_layer_id_t new_index, pcb_layergrp_id_t new_in_grp);
+int pcb_layer_move(pcb_board_t *pcb, pcb_layer_id_t old_index, pcb_layer_id_t new_index, pcb_layergrp_id_t new_in_grp, pcb_bool undoable);
 
 
 /* set up dst to be a bound layer with the right offset in the stack; src_pcb
Index: trunk/src/layer_grp.c
===================================================================
--- trunk/src/layer_grp.c	(revision 29681)
+++ trunk/src/layer_grp.c	(revision 29682)
@@ -517,7 +517,7 @@
 	return 0;
 }
 
-int pcb_layergrp_del(pcb_board_t *pcb, pcb_layergrp_id_t gid, int del_layers)
+int pcb_layergrp_del(pcb_board_t *pcb, pcb_layergrp_id_t gid, int del_layers, pcb_bool undoable)
 {
 	int n;
 	pcb_layer_stack_t *stk = &pcb->LayerGroups;
@@ -529,7 +529,7 @@
 		pcb_layer_t *l = pcb_get_layer(pcb->Data, stk->grp[gid].lid[n]);
 		if (l != NULL) {
 			if (del_layers) {
-				pcb_layer_move(pcb, stk->grp[gid].lid[n], -1, -1);
+				pcb_layer_move(pcb, stk->grp[gid].lid[n], -1, -1, undoable);
 				n = -1; /* restart counting because the layer remove code may have changed the order */
 			}
 			else {
@@ -591,7 +591,7 @@
 	pcb_layergrp_t *g = pcb_get_grp(LayerGroup, PCB_LYT_ANYWHERE, PCB_LYT_BOUNDARY);
 	if ((g != NULL) && (g[1].ltype & PCB_LYT_SUBSTRATE)) {
 		pcb_layergrp_id_t gid = g - LayerGroup->grp + 1;
-		pcb_layergrp_del(pcb, gid, 0);
+		pcb_layergrp_del(pcb, gid, 0, 0);
 	}
 }
 
Index: trunk/src/layer_grp.h
===================================================================
--- trunk/src/layer_grp.h	(revision 29681)
+++ trunk/src/layer_grp.h	(revision 29682)
@@ -114,7 +114,7 @@
 
 /* Remove a layer group; if del_layers is zero, layers are kept but detached
    (.grp = -1), else layers are deleted too */
-int pcb_layergrp_del(pcb_board_t *pcb, pcb_layergrp_id_t gid, int del_layers);
+int pcb_layergrp_del(pcb_board_t *pcb, pcb_layergrp_id_t gid, int del_layers, pcb_bool undoable);
 
 /* Remove a layer from a group */
 int pcb_layergrp_del_layer(pcb_board_t *pcb, pcb_layergrp_id_t gid, pcb_layer_id_t lid);
Index: trunk/src/object_act.c
===================================================================
--- trunk/src/object_act.c	(revision 29681)
+++ trunk/src/object_act.c	(revision 29682)
@@ -974,11 +974,11 @@
 			new_index = 0;
 	}
 	else if (strcmp(a1, "gi") == 0) {
-		PCB_ACT_IRES(pcb_layer_move(pcb, -1, 0, pcb_actd_EditGroup_gid));
+		PCB_ACT_IRES(pcb_layer_move(pcb, -1, 0, pcb_actd_EditGroup_gid, 1));
 		return 0;
 	}
 	else if (strcmp(a1, "ga") == 0) {
-		PCB_ACT_IRES(pcb_layer_move(pcb, -1, 1, pcb_actd_EditGroup_gid));
+		PCB_ACT_IRES(pcb_layer_move(pcb, -1, 1, pcb_actd_EditGroup_gid, 1));
 		return 0;
 	}
 	else if (strcmp(a1, "group") == 0) {
@@ -1033,7 +1033,7 @@
 		}
 	}
 
-	PCB_ACT_IRES(pcb_layer_move(pcb, old_index, new_index, -1));
+	PCB_ACT_IRES(pcb_layer_move(pcb, old_index, new_index, -1, 1));
 	return 0;
 }
 
Index: trunk/src_plugins/draw_csect/draw_csect.c
===================================================================
--- trunk/src_plugins/draw_csect/draw_csect.c	(revision 29681)
+++ trunk/src_plugins/draw_csect/draw_csect.c	(revision 29682)
@@ -769,11 +769,11 @@
 			}
 			else if (drag_delgrp) {
 				if (gactive >= 0) {
-					pcb_layergrp_del(PCB, gactive, 1);
+					pcb_layergrp_del(PCB, gactive, 1, 1);
 					if (pcb_layergrp_flags(PCB, gactive) & PCB_LYT_SUBSTRATE)
-						pcb_layergrp_del(PCB, gactive, 1);
+						pcb_layergrp_del(PCB, gactive, 1, 1);
 					else if (pcb_layergrp_flags(PCB, gactive-1) & PCB_LYT_SUBSTRATE)
-						pcb_layergrp_del(PCB, gactive-1, 1);
+						pcb_layergrp_del(PCB, gactive-1, 1, 1);
 				}
 				drag_delgrp = 0;
 				gactive = -1;
Index: trunk/src_plugins/io_mentor_cell/read.c
===================================================================
--- trunk/src_plugins/io_mentor_cell/read.c	(revision 29681)
+++ trunk/src_plugins/io_mentor_cell/read.c	(revision 29682)
@@ -1181,7 +1181,7 @@
 		const pcb_dflgmap_t *m;
 
 		while(ctx->pcb->LayerGroups.len > 0)
-			pcb_layergrp_del(ctx->pcb, 0, 1);
+			pcb_layergrp_del(ctx->pcb, 0, 1, 0);
 
 		for(m = pcb_dflg_top_noncop; m->name != NULL; m++) map[len++] = *m;
 
Index: trunk/src_plugins/io_pcb/file.c
===================================================================
--- trunk/src_plugins/io_pcb/file.c	(revision 29681)
+++ trunk/src_plugins/io_pcb/file.c	(revision 29682)
@@ -1147,7 +1147,7 @@
 	/* remove empty layer groups */
 	for(n = 0; n < pcb->LayerGroups.len; n++) {
 		if (pcb->LayerGroups.grp[n].len == 0) {
-			pcb_layergrp_del(pcb, n, 0);
+			pcb_layergrp_del(pcb, n, 0, 0);
 			n--;
 		}
 	}