Add notification observer on Mac

SineStriker

2023-12-27 88b5b56b6a67d93208eae3980af2f30da09dd8ae

 examples/shared/widgetframe/windowbutton.cpp

@@ -6,11 +6,9 @@

namespace QWK {

    WindowButtonPrivate::WindowButtonPrivate() {
    }
    WindowButtonPrivate::WindowButtonPrivate() = default;

    WindowButtonPrivate::~WindowButtonPrivate() {
    }
    WindowButtonPrivate::~WindowButtonPrivate() = default;

    void WindowButtonPrivate::init() {
    }