The engine can reach a Hanja reading back into the text the client
already holds, but only if the frontend hands that text over and can
take some of it away again. GTK 3 has both: retrieve-surrounding
brings the text around the cursor and delete-surrounding removes runes
before it, and a widget that answers neither leaves the text empty, so
nothing is ever reached into or taken from it.
The wire grows a control frame for the text, sent like the caret only
when it changes, and one byte in every response for the runes to take
back. That byte moves the length fields along, so the version goes to
2: an old daemon and a new module, either way round, fail the handshake
and the module falls through to GtkIMContextSimple rather than misread
a frame.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
srvnote and addrnote unlinked on any note at all, and plan9port marks
SIGPIPE Ignore: notify.c:59 lists it, and signotify runs the handler
chain first and only then finds the Ignore flag and returns. So one
broken pipe took the IPC socket and the IBus address file away from a
daemon that went on running -- measured on a private runtime dir, a
single kill -PIPE left the process in state Ssl with both files gone,
so every client that focused a widget afterwards silently had no input
method and only a restart brought it back.
libxcb writes with writev, so the note is a broken X connection away;
today xim.c's die() masks it by taking the daemon down on the same
event, which is exactly why the two must not depend on each other.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Cclientpreedit was a one-bit mask that every producer set as "want ?
Cclientpreedit : 0" and every consumer masked out again; nothing else
was ever going to join it. Keyreq carries clientpre, an int that says
whether the client draws the preedit, and the engine and the XIM
context keep it under that name.
A stopped daemon left its socket and IBus address file behind, since
plan9port ends a process on SIGTERM without running exit handlers. Both
files now go on a note as well as on exit, and only while they are still
the ones this daemon made, so a successor is never robbed of its own.
ipc.c: an AF_UNIX nonblocking connect completes at once or fails with
EAGAIN, so the EINPROGRESS/poll/SO_ERROR path and the fcntl juggling
were dead; the deadline plumbing checked a clock that cannot fail and
re-tested the deadline before every transfer although only waitfd
blocks; readfield's truncation and discard loop served the unit test,
since every caller owns char[Ipcfieldmax+1]; NULL-argument checks on
in-tree encoders are gone (peer validation stays). The primary key frame
is Ipckey, not 'legacy'; ipckeysym names the keysym mapping.
srv.c: the per-connection capability and caret already lived in the
persistent Keyreq; the mirror locals and 'negotiated' flag guarded a
protocol rule no client relied on. proccreate never fails in libthread.
gtk: focus-out no longer round-trips a reset before closing the socket
that releases the engine; the caret dedup compares the packed frame;
srvconnect's preedit no-ops and the insimple flag are gone.
