osx - QML Mac fullscreen mode lose mouse focus -

i'm using qml build osx application fullscreen mode support. intention toggle fullscreen/normal mode double-clicking main area of window, here minimal code:

import qtquick 2.4 import qtquick.window 2.2  window {     id: main     visible: true     width: 800; height: 480     flags: qt.window | qt.windowfullscreenbuttonhint // osx native behavior support      mousearea {         anchors.fill: parent         ondoubleclicked: {             if (main.visibility === window.fullscreen) {                 main.visibility = window.automaticvisibility;             } else {                 main.visibility = window.fullscreen;             }         }     } } 

it's simple, behavior weird:

whenever visibility state of application changes(enter or leave), user must click in window 1 more time before window mode can change again, the application loses mouse focus.

to validate i'm thinking, test more, add 1 more mousearea(let's mouseareatest) in window, split window side side , can receive onentered , onexited event. right after application enter or exit fullscreen mode, mouseareatest never receive enter or exit event, unless click on window one more time, not want.

i know nothing how osx implement own fullscreen mode, nor why qml on osx has such buggy problem. expect tell me it.

---

update

later doubted if qml related window system of qml, tried using traditional qtwidgets, , found same result there.

---

update

i tracked mouse event of traditional widget, , found problem: double click event consisted of 2 click event(press-release-press-release), when window state changd(fullscreen normal or normal fullscreen), the last release event never received unless click 1 more time.

i did more test: use button control window state, , problem gone, may consider bug of mouse event handle.

---

by way, post system info note:

osx 10.10.1
qt 5.4.1