Fix for multitude of print statements that SHM is not available when

displaying on Hummingbird PC X Display Server

gfx/src/motif/nsRenderingContextUnix.cpp

@@ -206,6 +206,16 @@ nsresult nsRenderingContextUnix :: CommonInit()
                      mContext->GetAppUnitsToDevUnits());
 
 #ifdef MITSHM
+
+  // We need to query the extension first using straight XLib since
+  // the Shared memory invocation prints an error message to stdout
+
+  PRInt32 maj, evt, err;
+
+  if (::XQueryExtension(mRenderingSurface->display,
+			"MIT-SHM",
+			&maj, &evt, &err) == True) {
+
     if (XShmQueryVersion(mRenderingSurface->display, 
 			 &shmMajor, 
 			 &shmMinor, 
@@ -215,6 +225,7 @@ nsresult nsRenderingContextUnix :: CommonInit()
       mRenderingSurface->shmImage = nsnull;
       mRenderingSurface->shmInfo.shmaddr = nsnull;
     }
+  }
 #endif
 
   return NS_OK;