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cmd: reset position to start of chunk on delete

--- a/chunk.c

+++ b/chunk.c

@@ -262,6 +262,7 @@

 }

 #undef ASSERT

+/* FIXME: should set .pos as well? or just bounds? s/setdot/setbounds/? */

 void

 setdot(Dot *dot, Chunk *right)

 {

--- a/cmd.c

+++ b/cmd.c

@@ -199,6 +199,7 @@

 	dprint(latch, "latched\n");

 	snarf(clone(latch, latch->left));

 	pushop(OPdel, dot.from, dot.from+chunklen(latch)-1, latch);

+	dot.pos = dot.from;

 	setdot(&dot, nil);

 	return 1;

 }