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Suppose you have some project opened and also opened java file in it. Focus is in editor. Now close the project using menu (File->Close <project name>). Now you have no opened files, and nothing in Projects view. But focus is in Navigator, which still contains information about last opened file. I've also noticed that the menu item I used to close a project is disable, but still contains name of the project which was opened.
*** This issue has been marked as a duplicate of 103938 ***