Notifications sounds are clipped at the end
Bug description
The notification sounds played by Gajim are clipped at the end. This is especially noticeable for "Attention", "Contact Connected", and "Contact Disconnected".
I am using PulseAudio as sound system, and the current Gajim nightly.
Steps to reproduce
Open the configuration dialogue and go to the "Manage Sounds" windows. Then use the play button there to play one of the aforementioned sounds, and observe how it clips at the end.
Software versions
OS version: Debian testing (amd64)
GTK version: 2.24.22
PyGTK version: 2.24.0
PulseAudio version: 4.0