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Master devices provide the union of all attached slave devices' buttons, i.e. the number of buttons on the master device is always the number of buttons of the slave device with the highest number of buttons. When slaves are attached or detached, the master device adjusts the button number to reflect the new buttons. On a slave switch, this slave's button labels are copied into the master (up to slave->num_buttons). The remaining button labels (if any) stay as they are. Thus, if any of the higher buttons is still pressed, it reflects the label of the last pressed device that provided this button. If two devices press the same button and it is differently labelled the last pressed one will be reflected in the master device. Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>