[Bug 46211] New: Please delay X11 initialization until needed by the application in order to avoid spurious X error message

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=46211

            Bug ID: 46211
           Summary: Please delay X11 initialization until needed by the
                    application in order to avoid spurious X error message
           Product: Wine
           Version: 3.0.3
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: winex11.drv
          Assignee: wine-bugs at winehq.org
          Reporter: vincent-wine at vinc17.net
      Distribution: ---

Wine should delay X11 initialization until it knows that X is needed by the
application. Otherwise one can get a spurious error message such as "Invalid
MIT-MAGIC-COOKIE-1 key" (in the past from Xlib, now from libxcb) while X11 is
actually not needed.

When Wine is used in scripts, e.g. for software testing (GNU MPFR in my case)
in such an environment, the error message can yield issues when parsing the
output.

I initially reported this bug in the Debian BTS:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914822

Note 1: Bug 2972 was about a similar issue: a spurious Xlib error message when
DISPLAY is not set. In my case, this is about a DISPLAY value that is no longer
valid because the X server has shut down in the meantime (I recall that X11 is
not needed for my tests, so that this shouldn't yield any failure). Thus this
is a bit different. Redirecting stderr to a file as suggested in bug 2972
(before it was fixed) may not be a solution as real error messages on stderr
can provide useful information and one may want to keep it together with normal
output.

Note 2: Since bug 2972 has been fixed, a workaround is to unset DISPLAY for the
tests (e.g. with "TESTS_ENVIRONMENT = env -u DISPLAY" in tests/Makefile.am), as
one knows that DISPLAY is useless. Still, I think that if DISPLAY is set, X11
initialization should be delayed until needed.

Note 3: The problem was made worse by the fact the error message does not end
with a newline character. This is what actually broke the parsing in my case. I
reported this bug there:
https://gitlab.freedesktop.org/xorg/lib/libx11/issues/80

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