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Debugger's support.java.ToolTipAnnotation holds reference to the last used document even after detach. This means this document (and the rest of the editor: copmponents, toolbars and so on) is held in memory even after closed. Because TTA is singletonized, it means at most one such document is held, but it'd be better to fix it anyway, the fix is trivial (just clear the reference after render()ing)
Cleared the member field reference after use.
Seems OK now
Fixed also in Nevada Patch 1 and in Arrow.