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backend/session: Run libseat callbacks on idle

Kenny Levinsen requested to merge github/fork/kennylevinsen/libseat-idle into master

libseat callbacks can be triggered from the stack of a libseat call if they were read while waiting for a return value. This is necessary as dispatch will not be called when the file descriptor has already been drained.

This leads to issues if we're called by libinput to close a device, and then handle a disable event that leads to libinput closing all its devices.

As workaround, break the stack on libseat events by executing them as idle events.

Fixes: https://github.com/swaywm/wlroots/issues/3200

TODO:

  • queued idle events could fire after wlr_session_destroy (use-after-free)

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