RFR: 6542: Improve calls to render in the flame view [v6]

[Miroslav Wengner]

> the Flameview shift fix during a fast scrolling over the selections: https://bugs.openjdk.java.net/browse/JMC-6542

Miroslav Wengner has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev
excludes the unrelated changes brought in by the merge/rebase. The pull request contains ten additional commits since
the last revision:

 - Merge branch 'master' of https://github.com/openjdk/jmc into feature/6542_Improve_calls_to_render_in_the_flame_view
 - 6542:  spotless needs
 - 6542: cleanup
 - 6542: typo correction
 - 6542: correction to aboring callable
 - 6542: minor changes
 - 6542: comments model calculation cancelation
 - 6542: cleanup
 - 6542: correction flameview display,  model calculation separation

-------------

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/133/files
  - new: https://git.openjdk.java.net/jmc/pull/133/files/3d6ec196..3b517a22

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=133&range=05
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=133&range=04-05

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jmc/pull/133.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/133/head:pull/133

PR: https://git.openjdk.java.net/jmc/pull/133