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backends: Do not reload keymap on new keyboard notifications

Carlos Garnacho requested to merge wip/carlosg/no-reload-keymap-on-keyboard-switch into master

XkbNewKeyboardNotify informs the client that there is a new keyboard driving the VCK. It is essentially meant to notify that the keyboard possibly has a different range of HW keycodes and/or a different geometry.

But the translation of those keycodes remain the same, and we don't do range checks or geometry checks (beyond using KEY_GRAVE as "key under Esc", but that is hardly one). It seems we can avoid the busywork that is releasing all our passive grabs, reloading the keymap and regenerating the keycombos and restoring the passive grabs.

Closes: #398

Edited by Carlos Garnacho

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