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   Pull up the following (catch-up-to-current), requested by mrg in #1130:

        external/mit/xorg-server/dist/ChangeLog         up to 1.1.1.29
        external/mit/xorg-server/dist/Makefile.in       up to 1.1.1.18
        external/mit/xorg-server/dist/aclocal.m4        up to 1.1.1.23
        external/mit/xorg-server/dist/compile           up to 1.1.1.13
        external/mit/xorg-server/dist/config.guess      up to 1.1.1.18
        external/mit/xorg-server/dist/config.sub        up to 1.1.1.18
        external/mit/xorg-server/dist/configure         up to 1.22
        external/mit/xorg-server/dist/configure.ac      up to 1.24
        external/mit/xorg-server/dist/depcomp           up to 1.1.1.11
        external/mit/xorg-server/dist/install-sh        up to 1.1.1.12
        external/mit/xorg-server/dist/ltmain.sh         up to 1.1.1.15
        external/mit/xorg-server/dist/meson.build       up to 1.1.1.19
        external/mit/xorg-server/dist/missing           up to 1.1.1.11
        external/mit/xorg-server/dist/test-driver       up to 1.1.1.9
        external/mit/xorg-server/dist/xorg-server.pc.in up to 1.1.1.5
        external/mit/xorg-server/dist/ylwrap            up to 1.1.1.11
        external/mit/xorg-server/dist/Xext/Makefile.in  up to 1.1.1.18

    [134 lines not shown]

   Register XFree86 DDX specific "XFree86_VT" Atom to appease xinit(1).

   Make sure to initialize default XKB rules earlier for Core Keyboard.

   merge xorg-server 21.1.18.

   initial import of xorg-server-21.1.18

   Make sure the keyboard device is actually enabled in DDXRingBell().

   Also use consistent variable names for readability.

   Allocate keyboard and mouse event buffers in the device private structures.

   Also simplify GetEvents functions.

   Allocate X68kKbdPriv dynamically to make it really private.

   DEVICE_OFF and DEVICE_CLOSE operations are adjusted accordingly.
   x68kGetKbdType() function is also added to get keyboard map type
   specified in the config file.

   Allocate X68kMousePriv dynamically to avoid static buffers.

   DEVICE_OFF and DEVICE_CLOSE operations are also adjusted.

   Reduce references to x68kKbdPriv and x68kMousePriv for readability.

   Refactor X68k input device handling to remove SIGIO based event processing.

   The keyboard and pointer input events are now processed directly
   using fd event notifications registered via DIX SetNotifyFd(),
   instead of the legacy SIGIO-based asynchronous I/O.

   Use consistent name for DeviceIntPtr variables among keyboard and mouse.

   Make sure the keyboard device is actually enabled in DDXRingBell().

   Also use consistent variable names for readability.

   No need to check if the device is enabled in event handler functions.

   These event handlers are activated by SetNotifyFd() only after
   DXX deviceProc() functions are called with DEVICE_ON from
   DIX EnableDevice() function.

   Remove unused variables.

   Add a static function declaration in sunMouse.c.

   Add and sort static function declarations in sunKbd.c.

   Allocate keyboard and mouse event buffers in the device private structures.

   Also simplify GetEvents functions.

   Tested on Sun 3/60 with bwtwo.

   Replace old FNDELAY for fcntl(2) with O_NONBLOCK defined in POSIX.

   Also Refactor sunKbdPrivRec in sunKbd.c to make it private.

   Now the keyboard device is opened and sunKbdPrivRec is dynamically
   allocated within the DEVICE_INIT phase of sunKbdProc().
   DEVICE_OFF and DEVICE_CLOSE operations are also adjusted accordingly.

   Tested on Sun 3/60.

   Refactor sunPtrPrivRec in sunMouse.c to make it really private.

   The mouse device is now opened and sunPtrPrivRec is allocated
   within the DEVICE_INIT phase of sunMouseProc().  DEVICE_OFF and
   DEVICE_CLOSE operations are also adjusted accordingly.

   Tested on Sun 3/60.

   Reduce global references to sunPtrPriv, as sunKbd.c does.

   Refactor Xsun input device handling to remove SIGIO based event processing.

   The keyboard and pointer input events are now processed directly
   using fd event notifications registered via DIX SetNotifyFd(),
   instead of the legacy SIGIO-based asynchronous I/O.

   This refactoring improves the maintainability and portability of
   the code by aligning with modern Xorg server practices.

   Tested on Sun 3/60 with bwtwo, Type-4 keyboard and mouse.

   Initialize DDX pointer valuators consistently with other drivers/servers.

   This may not be strictly necessary, since InitValuatorAxisStruct()
   for all axes is also called from the DIX InitPointerDeviceStruct()
   via InitValuatorClassDeviceStruct() with default values.

   However, for future X.Org updates, it is beneficial to keep the
   DIX-DDX interface implementation in MouseProc's DEVICE_INIT operation
   consistent with the official xf86-input-mouse driver, xquartz DDX server,
   and others.

   Properly apply DIX locking to input events in NetBSD-specific DDX servers.

   This thread-based DIX locking approach using input_lock() and
   input_unlock() has been available since X.Org 1.19.0:
    https://gitlab.freedesktop.org/xorg/xserver/-/commit/30ac7567980a1eb79d084a63e0e74e1d9a3af673

   All xfree86 DDX implementations have switched to using these new
   DIX locks instead of the old OsBlockSIGIO() / OsReleaseSIGIO() methods:
    https://gitlab.freedesktop.org/xorg/xserver/-/commit/6a5a4e60373c1386b311b2a8bb666c32d68a9d99

   The xquartz DDX (an official X.Org server implementation) also uses
   these locks for input events:
    https://gitlab.freedesktop.org/xorg/xserver/-/commit/7d6ebf3f4e4d517bb846d15a5deb131da19a267c

   This should resolve occasional SIGSEGVs in the Xsun server caused
   by NULL pointer dereferences around the event queue handlers
   under heavy load.

   Should be pulled up to netbsd-10.

   Xorg removed the ramdac module and related stuff, but the only part of this
   driver that depends on it is support for older GLINTs, and what we're
   interested in is permedia2 ( for sparc64, aka Sun PGX32 ) and permedia3.
   Therefore, disable all the old GLINT support, only leave permedia 2/3 support,
   and we have working X on PGX32 again.

   xf86-input-keyboard: add DEC LK401 keyboard map and WSKBD_TYPE_LK401

   xf86-input-keyboard: fix DEC LK201 layout

   On the LK201, the F11 serves as Escape by default. The key that's
   currently defined as Escape is actually grave/tilde. Also, the Delete
   key above Enter is actually a Backspace.

   do a better job finding the actual character boundaries

   merge xterm 397.