Review request for JMC-6593: Ensure that flame graphs are rendered starting with the thread roots first by default

[Marcus Hirt]

Hi all,

Please review this tiny change to ensure that flame graphs are
rendered starting with the thread roots first by default.

Jira: https://bugs.openjdk.java.net/browse/JMC-6593
diff -r df172d19598e
application/org.openjdk.jmc.flightrecorder.flameview/src/main/java/org/openjdk/jmc/flightrecorder/flameview/views/FlameGraphView.java
---
a/application/org.openjdk.jmc.flightrecorder.flameview/src/main/java/org/openjdk/jmc/flightrecorder/flameview/views/FlameGraphView.java
    Thu Oct 24 20:05:46 2019 +0200
+++
b/application/org.openjdk.jmc.flightrecorder.flameview/src/main/java/org/openjdk/jmc/flightrecorder/flameview/views/FlameGraphView.java
    Thu Oct 24 20:22:13 2019 +0200
@@ -81,7 +81,7 @@
        private SashForm container;
        private TraceNode currentRoot;
        private CompletableFuture<TraceNode> currentModelCalculator;
-       private boolean threadRootAtTop;
+       private boolean threadRootAtTop = true;
        private IItemCollection currentItems;
        private GroupByAction[] groupByActions;

Kind regards,
Marcus