Possible BUG on History CAS

[compsystems]

quote(a/b); ⇨ a/b
[up key][up key]copy ⇨ '( a/b' )

I think the problem is that the last expression is interpreted as a derivative diff(b),
-> diff( a/diff(b) )

The problem could be solved (copy input) if the expression has two ' at the beginning and end, are not derived is a single expression.