Fixed mouse grabbing on secondary monitors.

Added extra device polling when vsync is enabled, to reduce input lag.

src/java/org/lwjgl/opengl/Display.java

@@ -627,6 +627,7 @@ public final class Display {
 
 			display_impl.update();
 		}
+		pollDevices();
 	}
 
 	/**
@@ -666,8 +667,9 @@ public final class Display {
 					throw new RuntimeException(e);
 				}
 			}
+			if ( swap_interval != 0 ) // Handle events again when vsync is enabled, to reduced input lag.
+				processMessages();
 
-			pollDevices();
 			if ( parent_resized ) {
 				reshape();
 				parent_resized = false;

src/java/org/lwjgl/opengl/WindowsDisplay.java

@@ -542,6 +542,7 @@ final class WindowsDisplay implements DisplayImplementation {
 		if (getForegroundWindow() != hwnd && !hasParent)
 			return;
 		getGlobalClientRect(hwnd, rect);
+		/* -- This is wrong on multi-monitor setups
 		int local_offset_x = rect.left;
 		int local_offset_y = rect.top;
 		getGlobalClientRect(getDesktopWindow(), rect2);
@@ -551,6 +552,9 @@ final class WindowsDisplay implements DisplayImplementation {
 		nSetCursorPosition(center_x, center_y);
 		int local_x = center_x - local_offset_x;
 		int local_y = center_y - local_offset_y;
+		*/
+		int local_x = (rect.right - rect.left) / 2;
+		int local_y = (rect.bottom - rect.top) / 2;
 		if (current_display != null)
 			current_display.setMousePosition(local_x, transformY(hwnd, local_y));
 	}

src/native/windows/org_lwjgl_opengl_Display.c

@@ -121,8 +121,10 @@ static void handleMessages(JNIEnv *env) {
 				PM_REMOVE      // removal options
 				))
 	{
-		DispatchMessage(&msg);
+		if (msg.message == WM_QUIT) 
+			break; 
 		TranslateMessage(&msg);
+		DispatchMessage(&msg);
 	}
 }