Fix tests, BS in expansions and close #105.

test/autoclose_quotes.txt

@@ -36,3 +36,5 @@ set cpo=ces$
 " 'x" " 'x'"
 # Make sure we jump over a quote on the right. #89.
 "('test'x" "('test'x)"
+# Duplicate whole line when inserting quote at bol #105
+"}\<Home>'" "''}"