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backends/x11: Interpret keycode correctly

Pascal Nowack requested to merge pnowack/mutter:remote-desktop-sync-toggle-keys into master

Quoting the main commit message here:

Currently, when a remote desktop user submits a keycode, it will be
interpreted differently, when using the x11 session, instead of a
wayland session.
In a wayland session, submitting a keycode will have the expected
result (as if the key was pressed locally).
In a x11 session, this is not the case. Instead of getting the expected
key, some other key will be pressed (or sometimes even none).
The reason for this is that the native backend interprets the keycode
as evdev keycode and the x11 backend interprets the keycode as xkb
keycode.

To ensure that both backends produce the same behaviour when submitting
a keycode, fix the x11 backend to always interpret the keycode as evdev
keycode, instead of a xkb keycode.

Required by: gnome-remote-desktop!11 (merged)

Edited by Pascal Nowack

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