On Eclipse, with Window -> New Editor or by drag/drop method* I could have one more editor panes in my eclipse work area. Now how do I remove that extra pane when I do not need it anymore. All it allows me now is to minimize/maximize that editor extra pane. It just sticks around. Shouldn't there be a collapse or close extra editor panes (that is without me requiring to do Window->Reset Perspective!)
HandySplit has a flatten action that you need and other capabilities that you might find useful.