Please make "Inspect Hierarchy" a dockable view, similar to the Navigator window (but don't synchronize with the 
current editor as Navigator does). The use case is that I want to browse around sources in a class hierarchy, possibly 
editing them along the way. Not closing the "Inspect Hierarchy" window when double-clicking a node in the hierarchy (to 
open the corresponding source file in the editor) would already go a long way; but it would be even better if the 
window was a dockable view.