Version: 4.0.5 (KDE 4.0.5) (using 4.0.5 (KDE 4.0.5), 4.0.5-5.fc9 Fedora)
OS: Linux (i686) release 126.96.36.199-86.fc9.i686
Typing tab in window mode moves screen, makes bash completion impossible. Typing tab in full screen behaves as expected - passed to remote, and then to the shell.
Are you using VNC or RDP?
To clarify - the character is passed to remote, and remote bash shell invokes tab completion, but krdc may have scrolled it off the work area. Also, local X display is same size as remote VNC destop, 1024x768 in this case. Small, I know, but it's a decent, free laptop, and running linux. :-)
I have noticed this happens with mouse wheel events too if the viewer has scroll bars.
SVN commit 855003 by uwolfer:
Change the way how events (mouse, key and wheel) are handled: overwrite QWidget::event. This way we can prevent the wrong (in our case) handling of the tab key. Also simplifies code a lot.