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prevent copy to same directory

--- a/dirviewcmd.c

+++ b/dirviewcmd.c

@@ -74,6 +74,10 @@

 	p = dirviewcurrentpanel(dview);

 	o = dirviewotherpanel(dview);

+	if(dirmodeleq(p->model, o->model)){

+		errormessage("cannot copy files to the same directory.", mc, kc);

+		return;

+	}

 	nd = dirlist(p, &d);

 	if(nd == 1)

 		snprint(buf, sizeof buf, "copy %s '%s' to '%s' ?",