Properly enable/disable Xinerama support in nxagent via cmdline options provider…

nx-X11/programs/Xserver/hw/nxagent/Args.c

@@ -86,6 +86,18 @@ is" without express or implied warranty.
 
 #endif
 
+#ifdef PANORAMIX
+  #define PANORAMIX_DISABLED_COND (noPanoramiXExtension || PanoramiXExtensionDisabledHack)
+#else
+  #define PANORAMIX_DISABLED_COND TRUE
+#endif
+
+#ifdef RANDR
+  #define RRXINERAMA_DISABLED_COND noRRXineramaExtension
+#else
+  #define RRXINERAMA_DISABLED_COND TRUE
+#endif
+
 /*
  * Define this to force the dispatcher
  * to always use the dumb scheduler.
@@ -103,6 +115,8 @@ extern int _XGetBitsPerPixel(Display *dpy, int depth);
 
 extern char dispatchExceptionAtReset;
 
+extern const char *__progname;
+
 char nxagentDisplayName[1024];
 Bool nxagentSynchronize = False;
 
@@ -1047,6 +1061,13 @@ int ddxProcessArgument(int argc, char *argv[], int i)
     return 0;
   }
 
+  /*
+   * Disable Xinerama (i.e. fake it in Screen.c) if somehow Xinerama support
+   * has been disabled on the cmdline.
+   */
+  if (PANORAMIX_DISABLED_COND && RRXINERAMA_DISABLED_COND)
+    nxagentChangeOption(Xinerama, 0);
+
   return 0;
 }
 
@@ -1205,12 +1226,20 @@ static void nxagentParseOptions(char *name, char *value)
   }
   else if (!strcmp(name, "xinerama"))
   {
-#ifdef PANORAMIX
-    if (!PanoramiXExtensionDisabledHack)
-    {
+#if !defined(PANORAMIX) && !defined(RANDR)
+    nxagentChangeOption(Xinerama, 0);
+    fprintf(stderr, "Warning: No Xinerama support compiled into %s.\n", __progname);
+    return;
+#else
+    if (PANORAMIX_DISABLED_COND && RRXINERAMA_DISABLED_COND)
+      nxagentChangeOption(Xinerama, 0);
+      fprintf(stderr, "Warning: XINERAMA extension has been disabled on %s startup.\n", __progname);
+      return;
+
     if (!strcmp(value, "1"))
     {
       nxagentChangeOption(Xinerama, 1);
+      return;
     }
     else if (!strcmp(value, "0"))
     {
@@ -1221,17 +1250,8 @@ static void nxagentParseOptions(char *name, char *value)
       fprintf(stderr, "Warning: Ignoring bad value '%s' for option 'xinerama'.\n",
               validateString(value));
     }
-    }
-    else
-    {
-      nxagentChangeOption(Xinerama, 0);
-      fprintf(stderr, "Warning: Xinerama extension has been disabled via -disablexineramaextension cmdline switch.\n");
-    }
-#else
-    nxagentChangeOption(Xinerama, 0);
-    fprintf(stderr, "Warning: No Xinerama support compiled into nxagent.\n");
-#endif /* of PANORAMIX */
     return;
+#endif
   }
   else if (!strcmp(name, "resize"))
   {

nx-X11/programs/Xserver/hw/nxagent/Options.c

@@ -155,7 +155,7 @@ void nxagentInitOptions()
 
   nxagentOptions.ImageRateLimit = 0;
 
-  nxagentOptions.Xinerama = 0;
+  nxagentOptions.Xinerama = 1;
 
   nxagentOptions.SleepTime = DEFAULT_SLEEP_TIME;
 }

nx-X11/programs/Xserver/hw/nxagent/Options.h

@@ -390,12 +390,12 @@ typedef struct _AgentOptions
   int NoRootlessExit;
 
  /*
-  * Store if the user wants Xinerama. There's a variable called
-  * noPanoramiXExtension in os/utils.c but we cannot rely on that
-  * because RandR and Panoramix change its value when trying to
-  * initialize. So we use this variable to save the user preference
-  * provided by the -/+xinerama parameter before initalizing those
-  * extensions.
+  * Store if the user wants Xinerama. There are variables called
+  * noPanoramiXExtension noRRXineramaExtensison in os/utils.c but
+  * we cannot rely on them because RandR and PanoramiX change their
+  * values when trying to initialize. So we use this variable to
+  * save the user preference provided by the -/+(rr)xinerama parameter(s)
+  * before initalizing those extensions.
   */
 
   int Xinerama;

nx-X11/programs/Xserver/hw/nxagent/Screen.c

@@ -1114,11 +1114,6 @@ Bool nxagentOpenScreen(int index, ScreenPtr pScreen,
   nxagentChangeOption(ViewportXSpan, nxagentOption(Width) - nxagentOption(RootWidth));
   nxagentChangeOption(ViewportYSpan, nxagentOption(Height) - nxagentOption(RootHeight));
 
-  /* PanoramiXExtension enabled via cmdline, turn on Xinerama in nxagent
-   */
-  if( (!noPanoramiXExtension) && (!PanoramiXExtensionDisabledHack) )
-    nxagentOption(Xinerama) = True;
-
   if (nxagentReconnectTrap == 0)
   {
     if (nxagentOption(Persistent))