Index: lht_conf.h
===================================================================
--- lht_conf.h	(revision 34015)
+++ lht_conf.h	(revision 34016)
@@ -10,6 +10,7 @@
 			RND_CFT_BOOLEAN omit_font;       /* [dangerous] do not save the font subtree in board files */
 			RND_CFT_BOOLEAN omit_config;     /* [dangerous] do not save the config subtree in board files */
 			RND_CFT_BOOLEAN omit_styles;     /* do not save the routing styles subtree in board files */
+			RND_CFT_BOOLEAN denoise;         /* do not save rats, select/found/warn flags to reduce VCS diff noise */
 		} io_lihata;
 	} plugins;
 } conf_io_lihata_t;
Index: write.c
===================================================================
--- write.c	(revision 34015)
+++ write.c	(revision 34016)
@@ -231,6 +231,12 @@
 
 	fh.Flags = *f;
 
+	if (conf_io_lihata.plugins.io_lihata.denoise) {
+		PCB_FLAG_CLEAR(PCB_FLAG_SELECTED, &fh);
+		PCB_FLAG_CLEAR(PCB_FLAG_WARN, &fh);
+		PCB_FLAG_CLEAR(PCB_FLAG_FOUND, &fh);
+	}
+
 	hsh = lht_dom_node_alloc(LHT_HASH, "flags");
 
 	/* create normal flag nodes */
@@ -2062,7 +2068,7 @@
 }
 
 typedef struct {
-	int womit_font, womit_config, womit_styles;
+	int womit_font, womit_config, womit_styles, wdenoise;
 	int ver;
 } io_lihata_save_t;
 
@@ -2092,6 +2098,13 @@
 				RND_DAD_DEFAULT_NUM(sub->dlg, !!conf_io_lihata.plugins.io_lihata.omit_styles);
 				save->womit_styles = RND_DAD_CURRENT(sub->dlg);
 		RND_DAD_END(sub->dlg);
+		RND_DAD_BEGIN_HBOX(sub->dlg);
+			RND_DAD_LABEL(sub->dlg, "Denoise");
+				RND_DAD_HELP(sub->dlg, "Do not save volatile data:\nrats\nselect/warn/found flags\n");
+			RND_DAD_BOOL(sub->dlg);
+				RND_DAD_DEFAULT_NUM(sub->dlg, !!conf_io_lihata.plugins.io_lihata.denoise);
+				save->wdenoise = RND_DAD_CURRENT(sub->dlg);
+		RND_DAD_END(sub->dlg);
 	}
 	return save;
 }
@@ -2104,6 +2117,7 @@
 		int omit_font = !!sub->dlg[save->womit_font].val.lng;
 		int omit_config = !!sub->dlg[save->womit_config].val.lng;
 		int omit_styles = !!sub->dlg[save->womit_styles].val.lng;
+		int denoise = !!sub->dlg[save->wdenoise].val.lng;
 
 		if (omit_font != !!conf_io_lihata.plugins.io_lihata.omit_font)
 			rnd_conf_setf(RND_CFR_CLI, "plugins/io_lihata/omit_font", 0, "%d", omit_font);
@@ -2113,6 +2127,9 @@
 
 		if (omit_styles != !!conf_io_lihata.plugins.io_lihata.omit_styles)
 			rnd_conf_setf(RND_CFR_CLI, "plugins/io_lihata/omit_styles", 0, "%d", omit_styles);
+
+		if (denoise != !!conf_io_lihata.plugins.io_lihata.denoise)
+			rnd_conf_setf(RND_CFR_CLI, "plugins/io_lihata/denoise", 0, "%d", denoise);
 	}
 
 	free(save);