Selection is not handled properly in the top right pane

[irockel]

Selection is not handled properly in the right top pane. Reproduction (Sorry for the complicated explanation):

1. Open a thread dump file.
2. Select an item in the top left pane any of (Threads, Threads waiting for Monitors, ...) and remember that.
3. Select an item in the right top pane. Bottom pane is updated.
4. Select another item in the top left pane. (Threads, Threads waiting for Monitors, ...)
5. Select the same item as in step 2. The selection in the top right pane is done automatically again but the content of the bottom pane is not updated until you select another item in the top right pane. This is especially annoying when you have only one item in the top right pane. In this case you can not get the content again in the bottom pane without closing and reopening the dump file.

Moved from here: https://java.net/jira/browse/TDA-32