idle-notify: new protocol

This patch adds a new idle-notify protocol. It allows clients to be notified when the user is idle. Use-cases include messaging applications marking the user as away and clients saving resources when there's no activity.

This protocol is based on the org_kde_kwin_idle interface already being used by KDE and wlroots compositors. The protocol has been sent to wayland-protocols in 2015 1. This version renames and clarifies the interfaces, and addresses the review comments.

Signed-off-by: Simon Ser contact@emersion.fr Closes: #8 (closed)

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• Consider specifying that a zero timeout is valid
• Resolve !29 (comment 473468)

Potential future work:

• Consider making the seat argument null-able, to target all seats
• Consider adding an optional output argument for e.g. DPMS (how to tie that with input though?)

Inclusion requirements:

• Review: @davidedmundson
• 2 ACKs:
  • wlroots: @emersion
  • KWin: @davidedmundson
• 2 implementations:
  • KWin: https://invent.kde.org/plasma/kwin/-/merge_requests/2959
  • swayidle: https://github.com/swaywm/swayidle/pull/131
  • KWinFT: https://gitlab.com/kwinft/kwinft/-/merge_requests/248
  • kidletime: https://invent.kde.org/frameworks/kidletime/-/merge_requests/25