RFR: 6787: Simplified stack trace tree model [v7]

[Marcus Hirt]

On Thu, 19 Nov 2020 14:30:25 GMT, Marcus Hirt <hirt at openjdk.org> wrote:

>> Alex Ciminian has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 20 commits:
>> 
>>  - 6787: merge latest master and resolve conflicts
>>  - 6787: fix flame graph inverted stack selection
>>  - 6787: use 'not available' message when no events match
>>  - 6787: remove explicit nodeId handling and lookup map
>>  - 6787: make Node reference children instead of map lookup
>>  - 6787: add JSON tests for inverted flamegraphs
>>  - 6787: s/JSON/Json/ in all new files
>>  - 6787: more fixing of copyright notices
>>  - 6787: remove alphabetical sorting of nodes, use insertion order
>>  - 6787: add documentation, fix copyright notices
>>  - ... and 10 more: https://git.openjdk.java.net/jmc/compare/73fce3fd...3cd7473c
>
> Changes requested by hirt (Lead).

I'm getting some differences:
<img width="2267" alt="image" src="https://user-images.githubusercontent.com/16906077/100618156-bb091400-331b-11eb-9973-27a5a554c23c.png">
![image](https://user-images.githubusercontent.com/16906077/100618291-ed1a7600-331b-11eb-990e-4bf3e5076655.png)

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PR: https://git.openjdk.java.net/jmc/pull/159