Version: 0.9.6 (using KDE 4.6.5)
If you start klipper and enter some substring and/or select your desired clipboard content from klipper's history-list, in earlier versions a final press of ENTER key was sufficient to transfer your selection into the clipboard and close klipper's dialog. This is (was) the expected behavoiur, and this way, a highly ergonomical keyboard-only-usage was possible (if klipper's dialog was fired up by using a hotkey for the tray application).
Newly, you have to move your typing hand away from keyboard and click on your selection to close the dialog - I tested some eligible key combinations like SHIFT+ENTER, CTRL+ENTER, ALT+ENTER, Spacebar and so on. Unfortunately none of them worked, only a mouse click event.
Sadly, this is a deterioration in usability and should be reverted to its earlier state (ENTER key event accepts selected entry and closes dialog).
Btw, my Klipper states to be Version v0.9.7 (not in version list!)
Steps to Reproduce:
1) Start klipper dialog
(either by clicking the scissor icon in system tray or by a configured hotkey)
2) enter some substring and/or select an entry using arrow keys
so that it is highlighted
3) press ENTER key
Nothing happens (dialog stays open and unchanged).
The highlighted entry should be copied to clipboard and the dialog window should close.
Dialog should react to ENTER key press event (or any other eligible key)
Also Applies to Version 0.9.7 on KDE 4.7.2 (current Kubuntu)
*** This bug has been marked as a duplicate of bug 258749 ***