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Tabs in the "Output" pane look the same as edit tabs, so I expect to also be able to close them with a middle mouse click. But this seems to have the same effect as a left-click (or a right-click), and selects the tab instead. This is annoying, since I often end up with a lot of Output tabs that I want to close. This behaviour was observed on 6.5 rc1 on Gentoo.
output tabs are implemented differently, there may be output redesign after NetBeans 6.5...
*** This issue has been marked as a duplicate of 142336 ***