The splash window is only shown in x2go mode. In nxagent mode the
splash window was also shown, but empty (and thus invisible). And the
code waited for the splash window to disappear. Fix this by skipping
_all_ the splash stuff in nxagent mode.

Before there was no way of getting a white background despite having
the approriate code.

Backport of this commit:

  commit cb0a565d2b2cf8823abbd77b4426cc2237731dc1
  Author: Daniel Stone <daniel@fooishbar.org>
  Date:   Fri Aug 18 17:04:48 2006 +0300

    dix: add whiteroot flag
    Add a -wr option to use a white root window, and use a BackPixel rather
    than BackPixmap for both white and black root windows.

Fixes ArcticaProject/nx-libs#832

Fixes ArcticaProject/nx-libs#733

Attributes GH PR #828: https://github.com/ArcticaProject/nx-libs/pull/828

no more need to pass down a struct, we now only pass the milliseconds
and let the function do the rest.

Attributes GH PR #823: https://github.com/ArcticaProject/nx-libs/pull/823

The effect of this was that special keystrokes where detected and
passed to the nxagent. E.g. pressing ctrl-alt-f for Fullscreen also
produced an "f" in the current input window inside the nxagent.

Attributes GH PR #822: https://github.com/ArcticaProject/nx-libs/pull/822

With the removal of the Ipaq code there's no path anymore to open the
onscreen keyboard. Also nxkbd is not available and we do not have
tested that feature with any onscreen keyboard yet. So there's no
point in integrating that code.

Fixes ArcticaProject/nx-libs#405

Did we ever provide a binary?

Attributes GH PR #821: https://github.com/ArcticaProject/nx-libs/pull/821

This is a bit weird, I'd expect far more places where the compiler
could complain about Window vs Window64... But it does not.

Screen.c:306:32: warning: passing argument 3 of ‘XQueryTree’ from incompatible pointer type [-Wincompatible-pointer-types]
   if (XQueryTree(d, candidate, &root, &parent, &children, &num_children))
                                ^~~~~
In file included from Screen.c:60:
Agent.h:85:25: note: expected ‘Window64 *’ {aka ‘long unsigned int *’} but argument is of type ‘Window *’ {aka ‘unsigned int *’}
 #define Window          Window64
../../../../exports/include/nx-X11/Xlib.h:3041:5: note: in expansion of macro ‘Window’
     Window*  /* root_return */,

This fixes problems with kwin and compiz when using the
switch-all-screens keystroke. The fullscreen would appear shortly and
then vanish again.

Fixes ArcticaProject/nx-libs#458

Attributes GH PR #820: https://github.com/ArcticaProject/nx-libs/pull/820

Signed-off-by: Mario Trangoni <mjtrangoni@gmail.com>

Signed-off-by: Mario Trangoni <mjtrangoni@gmail.com>

Attributes GH PR #818: https://github.com/ArcticaProject/nx-libs/pull/818

We can only free the xkbDevicePrivate because we do not know the
details of any other (possible) extension. So let's limit to that one
private for now and call the new xkbFreePrivates from dix (where such
a function is completely missing).

Attributes GH PR #815: https://github.com/ArcticaProject/nx-libs/pull/815

there's more work to do...

The whole nx-X11/extras dir is no longer checked since we only have
Mesa there and we do not want to check that mess...

All the exceptions in static-analysis-suppressions have been manually
checked.

[nx-X11/programs/Xserver/record/set.c:361]: (warning) Possible null pointer dereference: stackIntervals

stackIntervals is only NULL if nIntervals is 0, too. In that case
memcpy will do nothing and so it is ok to pass NULL as source. But it
is ugly nevertheless...

[Keyboard.c:559]: (error) Shifting signed 32-bit value by 31 bits is undefined behaviour

  commit 758393951233d1b2520cf4cefd33ec4288a3880a
  Author: Dave Airlie <airlied@redhat.com>
  Date:   Wed Sep 12 11:09:40 2018 +1000

    xkb: fix what looks to be a copy-paste error with first vs firstMM

    Pointed out by coverity.
Signed-off-by: Dave Airlie <airlied@redhat.com>

xkmread.c: In function ‘XkmReadFileSectionName’:
xkmread.c:1181:25: warning: ‘tmpTOC.type’ may be used uninitialized in this function [-Wmaybe-uninitialized]
     XkbConfigText(tmpTOC.type,XkbMessage),0);

  commit 83913de25d35709b3ab7b0ab124b73924145d2dd
  Author: Adam Jackson <ajax@redhat.com>
  Date:   Thu Apr 5 12:59:11 2018 -0400

    xkb: Silence some compiler warnings

    Of the form:

    ../xkb/XKBGAlloc.c: In function ‘SrvXkbAddGeomKeyAlias’:
    ../xkb/XKBGAlloc.c:591:13: warning: ‘strncpy’ specified bound 4 equals destination size [-Wstringop-truncation]
                 strncpy(alias->real, realStr, XkbKeyNameLength);
                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    This is intentional; the code that reads from these fields never reads
    more than 4 bytes anyway. Rephrase things in terms of memcpy so that's
    clear. Obviously this is awful but in XKB awful is par.
Signed-off-by: Adam Jackson <ajax@redhat.com>
Acked-by: Keith Packard <keithp@keithp.com>

  commit a4a2e814d5d0e6152307a301eda1d6fc1c555aaa
  Author: Alan Coopersmith <alan.coopersmith@oracle.com>
  Date:   Sun Feb 13 21:36:02 2011 -0800

    xkb: Use snprintf to measure string lengths instead of manual strlen math
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Daniel Stone <daniel@fooishbar.org>

  commit 2391c409a2840d61fed93832650c0d6c82ebebdf
  Author: Eamon Walsh <ewalsh@tycho.nsa.gov>
  Date:   Fri Jun 13 22:48:17 2008 -0400

    Fix "warning: unused variable `s'".

  commit 534fc5140b039a8c98ab715d0a6740d513b41209
  Author: Daniel Stone <daniel@fooishbar.org>
  Date:   Sun Feb 3 23:30:22 2008 +1100

    XKB: Remove a bunch of mad ifdefs

    We have SEEK_SET and size_t, seriously.  Also use DebugF instead of
    ifdef DEBUG, and ditch a couple of random bits that were never used.

Fixes this cppcheck finding:
[nx-X11/programs/Xserver/xkb/xkbActions.c:1306]: (error) Uninitialized variable: oldState

  commit 35a4b8e7f4526a92d44cb16a783f21030cd1f6df
  Author: Peter Hutterer <peter.hutterer@who-t.net>
  Date:   Tue May 5 16:51:59 2009 +1000

    xkb: remove oldState from XkbHandleActions.

    I really don't know what the purpose of this variable is or was, aside from
    potentially clobbering up our key state since there's a path where it may be
    used uninitialised.

    Also, this means that xkbi->prev_state is now accessible from the DIX with
    meaningful data.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>