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Created attachment 109175 [details] Thread dump Dev build, JDK 7. Switched Nav mode to "Trees (NB Dev)" and started moving selection using the arrow keys. Suddenly the IDE froze with ~50% CPU.
Seems to happen frequently when selecting (not just expanding & viewing) nodes, so something to do with the corresponding selection in the open editor window.
org.netbeans.modules.java.debug.TreeNode is not production code. The tree element navigator is not shown to the regular users of the IDE --> P3.
And this whole module belongs to Lahvac ....
Fixed jet-main 5f36080183ea
Integrated into 'main-silver', will be available in build *201606220002* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/5f36080183ea User: Tomas Zezula <tzezula@netbeans.org> Log: #199792:Hang when using "Trees" navigator view