RFR: 4819: Improved tooltips and context menus for Stack Trace View [v2]

[Miroslav Wengner]

> bug fix: https://bugs.openjdk.java.net/browse/JMC-4819 tooltips
> 
> I'd propose, if not created yet, to create a ticket according to the correct behaviour of Stacktrace when treeView is selected (enabled/disabled) and switching over branches with enabled/disabled "Layout Option -> Reduce Tree Depth". Also when the current setup us saved and JMC reopened.

Miroslav Wengner has updated the pull request incrementally with one additional commit since the last revision:

  4819: cleanup, uncessary code

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

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/140/files
  - new: https://git.openjdk.java.net/jmc/pull/140/files/e8cdb1da..dff28af4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=140&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=140&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/140.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/140/head:pull/140

PR: https://git.openjdk.java.net/jmc/pull/140