JMC-5368: Clear Stacktrace View when editor is closed

[Marcus Hirt]

LGTM! :)

Kind regards,
Marcus

On Tue, Jun 4, 2019 at 10:44 PM Ken Dobson <kdobson at redhat.com> wrote:

> Here's a small patch that clears the stacktrace view when all JfrEditors
> are closed rather than persisting the most recent stacktrace.
>
> Bug ID: https://bugs.openjdk.java.net/browse/JMC-5368
> Webrev: http://cr.openjdk.java.net/~kdobson/JMC-5368/webrev/
>
> Thanks,
>
> Ken Dobson
>