Improve xdg activation token integration - #9205
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Implement for_exec_window <commands> <exec command> to run the list of commands on the next window created by the executed process. The window is matched based on the process ID (PID) of the spawned process.
- Add initial_activation_token criteria to match windows by their XDG activation token (or X11 startup ID). - Expose initial_activation_token in the window JSON representation (get_tree).
Implement IPC_MINT_ACTIVATION_TOKEN (102) to request the compositor to mint a new XDG activation token. Add corresponding support to swaymsg and document it in the man pages and completions.
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The xdg activation token mechanism was designed primarily to prevent focus stealing, but also allows a "launch request" to be matched to the corresponding top-level window that is ultimately mapped as a result via the unique activation token. While not universally supported by all applications, it is now fairly widely supported.
This PR adds a number of related improvements to the existing support in sway for the activation token protocol:
mint_activation_tokenIPC command for creating a new activation tokeninitial_activation_tokenas a property in the JSON representation, to allow IPC clients to match a window with a corresponding launch request.initial_activation_tokenas a single-use, automatically cleaned up criteria.for_exec_windowcommand that runs an external program, likeexec, and also specifies a list of sway commands to run on the window once it maps.