Set cursor sprite globally

Pointer are global, not screen specific. Hence so is also the cursor
sprite.

unix/xserver/hw/vnc/vncExtInit.cc

@@ -394,10 +394,14 @@ void vncAddCopied(int scrIdx, const struct UpdateRect *extents,
   desktop[scrIdx]->add_copied(reg, rfb::Point(dx, dy));
 }
 
-void vncSetCursor(int scrIdx, int width, int height, int hotX, int hotY,
+void vncSetCursor(int width, int height, int hotX, int hotY,
                   const unsigned char *rgbaData)
 {
-  desktop[scrIdx]->setCursor(width, height, hotX, hotY, rgbaData);
+  for (int scr = 0; scr < vncGetScreenCount(); scr++) {
+    if (desktop[scr] == NULL)
+      continue;
+    desktop[scr]->setCursor(width, height, hotX, hotY, rgbaData);
+  }
 }
 
 void vncPreScreenResize(int scrIdx)

unix/xserver/hw/vnc/vncExtInit.h

@@ -84,7 +84,7 @@ void vncAddCopied(int scrIdx, const struct UpdateRect *extents,
                   int nRects, const struct UpdateRect *rects,
                   int dx, int dy);
 
-void vncSetCursor(int scrIdx, int width, int height, int hotX, int hotY,
+void vncSetCursor(int width, int height, int hotX, int hotY,
                   const unsigned char *rgbaData);
 
 void vncPreScreenResize(int scrIdx);

unix/xserver/hw/vnc/vncHooks.c

@@ -699,7 +699,7 @@ static Bool vncHooksDisplayCursor(DeviceIntPtr pDev,
     }
 #endif
 
-    vncSetCursor(pScreen->myNum, width, height, hotX, hotY, rgbaData);
+    vncSetCursor(width, height, hotX, hotY, rgbaData);
 
     free(rgbaData);
   }