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Notes on the device event controller machinery
----------------------------------------------
In pyatspi2, `Registry.setReferenceWIndow()` is misspelled. However,
that function is never called in Orca or elsewhere, as far as I can
tell.
This ties down to `atspi_registry_set_reference_window()`, which just
calls `_atspi_mutter_set_reference_window()`. The side effect of that
is to set the `ATSPI_MUTTER_DATA.window_id` and
`window_id_is_explicit`, but again, those fields never get used in the
`atspi-mutter.c` code. I think they were meant to be used in
`_atspi_mutter_generate_keyboard_event` or
`_atspi_mutter_generate_mouse_event`.
Relatedly, `_atspi_mutter_generate_keyboard_event` takes a `keystring`
argument but it's not used.
What is incomplete here?
Refactoring plan
----------------
While the device event controller (DEC) code works for X11, it doesn't
work for Wayland because there are no hooks there to sniff the
keyboard or mouse.
However, the machinery to synthesize events is presumably still
useful. I'd like to be able to add tests for it.
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