hg: jdk9/dev/langtools: 8080843: JShell tool: invalid key error occurs when external editor is used

[robert.field at oracle.com]

Changeset: 472bcb7c8850
Author:    rfield
Date:      2016-05-31 14:02 -0700
URL:       http://hg.openjdk.java.net/jdk9/dev/langtools/rev/472bcb7c8850

8080843: JShell tool: invalid key error occurs when external editor is used
Reviewed-by: vromero

! src/jdk.jshell/share/classes/jdk/internal/jshell/tool/ExternalEditor.java
! test/jdk/jshell/ExternalEditorTest.java