RFR: 7121: Unhandled exception while working with Thread Graphs

[Marcus Hirt]

On Thu, 4 Feb 2021 22:28:51 GMT, Alex Macdonald <aptmac at openjdk.org> wrote:

> This short PR addresses JMC-7121 [0], in which a  division by 0 error can occur when viewing the threads page with a focused selection that has no relevant thread information. A big thanks to Bipin for catching this, but for also providing easy steps to reproduce the issue.
> 
> The fix here adds a check when initializing the minimum lane height, ensuring that the default value gets set if there are no items.
> 
> [0] https://bugs.openjdk.java.net/browse/JMC-7121

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/210