Version: CVS (using KDE Devel) I was typing #include " and got a completion popup. I only had three include files in the project. The popup contains a disabled scroll bar but the width of the popup window is being computed as if there is no scroll bar. Outcome is that the ends of the filenames are obscured. Bug is scrollbar should have been hidden.
The popup implementation lies within katepart. Reassigning.
This seems to be fixed since some time: the completion popup list is resized to fit the number of completions and the scrollbars hidden if not needed.