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STATE_TRACKING.md

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State Tracking in the Wayland Agent

The Wayland agent must maintain a lot of per-window state. Doing so improperly has been a significant source of bugs. This document specifies how the state should be handled.

Window size and position

struct qubes_output stores two copies of the size and position of each window.

  • struct qubes_output::host stores the most recent values sent by the host, or the guest’s values if no MSG_CONFIGURE has been received yet.
  • struct qubes_output::guest stores the most recent values known, period. A valid MSG_CONFIGURE from the host updates both qubes_output::host and qubes_output::guest.

Additionally, if struct qubes_output::flags contains QUBES_OUTPUT_IGNORE_CLIENT_RESIZE, changes to the bounding box provided by the client must be ignored.