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@ -196,15 +196,81 @@ code <TODO>`__ :-/ (Actually, XWayland might not process key events itself, inst
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just passing them to clients, but this seems inconsistent with the issue – what
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else would be introducing the second group switch?)
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.. understanding xev, XKeyEvents &c.
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.. Note: neither xev is very barebones and does very little postprocessing of
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events. (naturally.)
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.. X11: state: 0x2000, sway: 0x4000 or 0x0. These state bits are *not*
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mentioned in libX11 docs… (bits 13 and 14)
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So now I need to understand a (hopefully small) parts of two protocols: X11 to
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understand what the X11 clients receive from XWayland, and Wayland to
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understand what XWayland gets from my compositor.
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Understanding X11
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-----------------
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This part is maybe the easier one, because ``xev`` pretty much dumps the data.
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I should check in the server code as well, but for the Czech chords ``xev``
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seems to receive ``KeyEvents`` with state ``0x2000`` under Xorg (i3wm) and with
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``0x4000`` under XWayland when three groups are set up (for two groups the
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state is ``0x0``, i.e. the same as for English keypresses). State bits this
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high encode the active group and are described in `the relevant part
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<https://www.x.org/releases/current/doc/kbproto/xkbproto.html#Computing_A_State_Field_from_an_XKB_State>`__
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of `the XKB extension documentation
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<https://www.x.org/releases/current/doc/kbproto/xkbproto.html>`__.
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We can see that if we set the ``GroupsWrap`` control of XKB (I don't know
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where/how yet) to ``ClampIntoRange`` it should also help work around the
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problem. But our goal is to align behaviour of XWayland and JustWayland, i.e.
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prevent XWayland seeing two group shifts, not to hack our way in either
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protocol, so we do not stop here.
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.. Read also xkbproto: Server Internal Modifiers and Ignore Locks Behavior (might explain sth?)
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At this point, I had an approximate idea of how XKB is supposed to do,
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hopefully. I have not yet read the implementation in XWayland though…
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Understanding Wayland
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---------------------
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This part is supposed to also be simple: the core Wayland protocol will send us
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`wl_keyboard::keymap <TODO>`__, `wl_keyboard::key <TODO>`__ and
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`wl_keyboard::modifiers <TODO>`__ events containing the required data.
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The client does not seem to have a say in what kind of keymap it will get, it
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is up to the compositor. This means that even XWayland cannot say it wants raw
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data, but ``xkb_v1``-style keycodes are probably close.
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While exploring what happens I found a bug in ``wev`` (as of version 1.0.0-13
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in Arch): for wl_keyboard::modifiers the group is reported as the serial
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number::
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[14: wl_keyboard] key: serial: 238464; time: 554528472; key: 66; state: 1 (pressed)
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sym: Mode_switch (65406), utf8: ''
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[14: wl_keyboard] modifiers: serial: 1; group: 0
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depressed: 00000000
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latched: 00000000
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locked: 00000000
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Apparently I am `fixing <TODO>`__ more than one project :-)
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Note: Currently, SourceHut is down (TODO: remove this when sr.ht is up), so I
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cannot link you to my patch, so here it is instead::
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--- wev.c.orig 2024-01-13 22:38:03.739239211 +0100
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+++ wev.c 2024-01-13 22:38:08.012465335 +0100
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@@ -368,7 +368,7 @@
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uint32_t mods_locked, uint32_t group) {
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struct wev_state *state = data;
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int n = proxy_log(state, (struct wl_proxy *)wl_keyboard, "modifiers",
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- "serial: %d; group: %d\n", group);
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+ "serial: %d; group: %d\n", serial, group);
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if (n != 0) {
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printf(SPACER "depressed: %08X", mods_depressed);
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print_modifiers(state, mods_depressed);
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But I am also interested in what is exchanged between the compositor and
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XWayland server. And there does not seem to be any kind of sniffer yet, so `I
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started writing one <https://gitea.ledoian.cz/LEdoian/sopass/>`__
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.. TO-MENTION:
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- nested compositor issues
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- the IM resolves compose? (I could bisect it, but too lazy)
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- copy my issue comment in case link rots.
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- list of all the packages I had downloaded and compiled
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.. TODO: rename XWayland to Xwayland…
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