Index: data.c
===================================================================
--- data.c	(revision 29741)
+++ data.c	(revision 29742)
@@ -399,6 +399,7 @@
 void pcb_data_mirror(pcb_data_t *data, pcb_coord_t y_offs, pcb_data_mirror_text_t mtxt, pcb_bool pstk_smirror, pcb_bool undoable)
 {
 	pcb_undo_freeze_serial();
+	pcb_data_clip_inhibit_inc(data);
 	PCB_PADSTACK_LOOP(data);
 	{
 		pcb_pstk_mirror(padstack, y_offs, pstk_smirror, 0, undoable);
@@ -443,6 +444,7 @@
 			PCB_ENDALL_LOOP;
 			break;
 	}
+	pcb_data_clip_inhibit_dec(data, 0);
 	pcb_undo_unfreeze_serial();
 	pcb_undo_inc_serial();
 }