hg: jdk9/sandbox/jdk: Generalized EditingHistory cleanup

[jan.lahoda at oracle.com]

Changeset: 1aa79254b0a1
Author:    jlahoda
Date:      2016-05-11 13:58 +0200
URL:       http://hg.openjdk.java.net/jdk9/sandbox/jdk/rev/1aa79254b0a1

Generalized EditingHistory cleanup

! src/jdk.internal.le/share/classes/jdk/internal/jline/extra/EditingHistory.java
+ test/jdk/internal/jline/extra/HistoryTest.java