Guys not sure this is the rightmost place to post but seems there is an ongoing but on KDE/Libreoffice with the PT-br language duplicating all the input. It has being observed mainly in arch linux and its derivatives as manjaro and antergos. The upstream bug report is here. The post on Manjaro board is here . Still we could not pinpoint a solution. It is something with KDE and I believe the VLC plugin. Reason for my belief is that if I open libre office with another DE the bug is not present. Maybe someone here could also take a look/have an idea.

Regards,
vfbsilva