OSX/Cocoa: Mouse up was not sent to WM after window resize

intern/ghost/intern/GHOST_SystemCocoa.mm

@@ -1059,6 +1059,8 @@ GHOST_TSuccess GHOST_SystemCocoa::handleWindowEvent(GHOST_TEventType eventType,
 					//Enforce only one resize message per event loop (coalescing all the live resize messages)					
 					window->updateDrawingContext();
 					pushEvent( new GHOST_Event(getMilliSeconds(), GHOST_kEventWindowSize, window) );
+					//Mouse up event is trapped by the resizing event loop, so send it anyway to the window manager
+					pushEvent(new GHOST_EventButton(getMilliSeconds(), GHOST_kEventButtonUp, window, convertButton(0)));
 					m_ignoreWindowSizedMessages = true;
 				}
 				break;