To all Linux/Unix users. Idea does not support the X-Windows style copy-paste, where you select a text and then paste it using the middle mouse button.
To my opinion this should be possible. Now, IDEA does not nicely integrate with other Linux applications.
Note that this select-paste should not only be possible from within IDEA, but should also work in combination with other applications. That this is possible in Java applications is demonstrated by JEdit (www.jedit.org).
So please all vote for feature request #33820 to force this functionality in :)