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In other words, combine what Ctrl+P does with what Ctrl+Shift+Space does. The argument positioning info that Ctrl+P shows would be more helpful if the Javadoc would be displayed along with it. Also, displaying the complete method signature (including method name, return type and - where applicable - type parameters (e.g. the <T> in Collections.emptyList())) instead of just the method parameters in the Ctrl+P popup would be helpful. (Compare with what MS Visual Studio does on Ctrl+Shift+Space.)