X11::Protocol::Ext::MIT_SUNDRY_NONSTANDARD - X11R2/R3 compatibility mode

       The MIT-SUNDRY-NONSTANDARD extension controls a "bug mode" setting in the server which helps some X11R2
       and X11R3 client programs, including "xterm" from those releases.

       Bug mode means: relaxing event mask checking in grab pointer and button requests and window do-not-
       propagate attributes (to ignore mask bits which are not applicable); something for non-overlapping
       sibling window stacking order; and keeping maximum keycode below 255 to avoid an Xt toolkit segfault.
       Unless working with old client programs then these things are unlikely to be of interest.

       <http://user42.tuxfamily.org/x11-protocol-other/index.html>

       Copyright 2011, 2012, 2013, 2014, 2017 Kevin Ryde

       X11-Protocol-Other  is free software; you can redistribute it and/or modify it under the terms of the GNU
       General Public License as published by the Free Software  Foundation;  either  version  3,  or  (at  your
       option) any later version.

       X11-Protocol-Other  is  distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
       even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See  the  GNU  General
       Public License for more details.

       You should have received a copy of the GNU General Public License along with X11-Protocol-Other.  If not,
       see <http://www.gnu.org/licenses/>.

perl v5.28.1                                       2019-08-26             X11::Protocol::...DRY_NONSTANDARD(3pm)

       X11::Protocol::Ext::MIT_SUNDRY_NONSTANDARD - X11R2/R3 compatibility mode

       The following are made available with an "init_extension()" per "EXTENSIONS" in X11::Protocol.

           my $bool = $X->init_extension('MIT-SUNDRY-NONSTANDARD');

       "$X->MitSundryNonstandardSetBugMode ($flag)"
       "$flag = $X->MitSundryNonstandardGetBugMode ()"
           Get or set the bug mode flag.  1 means compatibility mode is on, 0 means off.

       X11::Protocol

       xset(1) "bc" option to control the bug flag from the command line.

       Xserver(1) "bc" command-line option to set the flag at server startup.

        use X11::Protocol;
        my $X = X11::Protocol->new;
        $X->init_extension('MIT-SUNDRY-NONSTANDARD')
          or print "MIT-SUNDRY-NONSTANDARD extension not available";