[*] Forward port aus Qt5.15.x modifications (fa1e8e30-cdb97232)

[*] Make menu/setmenu visible again

Change-Id: I67d57ea65edab26154fc92705cd34863c996eced

src/corelib/CMakeLists.txt

@@ -147,6 +147,7 @@ qt_internal_add_module(Core
         io/qzipreader_p.h io/qzipwriter_p.h io/qzip.cpp
         kernel/qabstracteventdispatcher.cpp kernel/qabstracteventdispatcher.h kernel/qabstracteventdispatcher_p.h
         kernel/qabstractnativeeventfilter.cpp kernel/qabstractnativeeventfilter.h
+        kernel/qthreadawareeventdispatcher.cpp
         kernel/qapplicationstatic.h
         kernel/qassociativeiterable.cpp kernel/qassociativeiterable.h
         kernel/qbasictimer.cpp kernel/qbasictimer.h

src/corelib/kernel/qbasictimer.cpp

@@ -4,6 +4,7 @@
 #include "qbasictimer.h"
 #include "qabstracteventdispatcher.h"
 #include "qabstracteventdispatcher_p.h"
+#include "qthreadawareeventdispatcher_i.hpp"
 
 QT_BEGIN_NAMESPACE
 
@@ -158,10 +159,15 @@ void QBasicTimer::start(std::chrono::milliseconds duration, Qt::TimerType timerT
         qWarning("QBasicTimer::start: QBasicTimer can only be used with threads started with QThread");
         return;
     }
-    if (Q_UNLIKELY(obj && obj->thread() != eventDispatcher->thread())) {
-        qWarning("QBasicTimer::start: Timers cannot be started from another thread");
-        return;
+    
+    if (!gGlobalEventDispatcher)
+    {
+        if (Q_UNLIKELY(obj && obj->thread() != eventDispatcher->thread())) {
+            qWarning("QBasicTimer::start: Timers cannot be started from another thread");
+            return;
+        }
     }
+  
     stop();
     if (obj)
         id = eventDispatcher->registerTimer(duration.count(), timerType, obj);
@@ -176,10 +182,22 @@ void QBasicTimer::stop()
 {
     if (id) {
         QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
-        if (eventDispatcher && !eventDispatcher->unregisterTimer(id)) {
-            qWarning("QBasicTimer::stop: Failed. Possibly trying to stop from a different thread");
-            return;
+        
+        if (!gGlobalEventDispatcher)
+        {
+            if (eventDispatcher && !eventDispatcher->unregisterTimer(id)) {
+                qWarning("QBasicTimer::stop: Failed. Possibly trying to stop from a different thread");
+                return;
+            }
         }
+        else
+        {
+            if (!gGlobalEventDispatcher->unregisterTimer(id)) {
+                qWarning("QBasicTimer::stop: Failed. Possibly trying to stop from a different thread");
+                return;
+            }
+        }
+        
         QAbstractEventDispatcherPrivate::releaseTimerId(id);
     }
     id = 0;

src/corelib/kernel/qcoreapplication.cpp

@@ -109,6 +109,8 @@
 #include <memory>
 #include <string>
 
+#include "qthreadawareeventdispatcher_i.hpp"
+
 QT_BEGIN_NAMESPACE
 
 using namespace Qt::StringLiterals;
@@ -506,6 +508,11 @@ void QCoreApplicationPrivate::cleanupThreadData()
 void QCoreApplicationPrivate::createEventDispatcher()
 {
     Q_Q(QCoreApplication);
+        
+    if (gGlobalEventDispatcher) {
+        return;
+    }
+    
     QThreadData *data = QThreadData::current();
     Q_ASSERT(!data->hasEventDispatcher());
     eventDispatcher = data->createEventDispatcher();
@@ -900,14 +907,18 @@ void Q_TRACE_INSTRUMENT(qtcore) QCoreApplicationPrivate::init()
     auto thisThreadData = threadData.loadRelaxed();
     eventDispatcher = thisThreadData->eventDispatcher.loadRelaxed();
     
-    // otherwise we create one
-    if (!eventDispatcher)
-        createEventDispatcher();
-    Q_ASSERT(eventDispatcher);
+    if (gGlobalEventDispatcher) {
+        eventDispatcher = gGlobalEventDispatcher;
+    } else {
+        // otherwise we create one
+        if (!eventDispatcher)
+            createEventDispatcher();
+        Q_ASSERT(eventDispatcher);
 
-    if (!eventDispatcher->parent()) {
-        eventDispatcher->moveToThread(thisThreadData->thread.loadAcquire());
-        eventDispatcher->setParent(q);
+        if (!eventDispatcher->parent()) {
+            eventDispatcher->moveToThread(thisThreadData->thread.loadAcquire());
+            eventDispatcher->setParent(q);
+        }
     }
 
     thisThreadData->eventDispatcher = eventDispatcher;

src/corelib/kernel/qthreadawareeventdispatcher.cpp

@@ -0,0 +1,3 @@
+#include "qthreadawareeventdispatcher_i.hpp"
+
+SECRET_PLATFORM_EXPORT QAbstractEventDispatcher *gGlobalEventDispatcher = {};

src/corelib/kernel/qthreadawareeventdispatcher_i.hpp

@@ -0,0 +1,8 @@
+#pragma once
+
+#if !defined(SECRET_PLATFORM_EXPORT)
+    #define SECRET_PLATFORM_EXPORT __declspec(dllexport)
+#endif
+
+
+extern SECRET_PLATFORM_EXPORT QAbstractEventDispatcher *gGlobalEventDispatcher;

src/corelib/thread/qthread.cpp

@@ -14,6 +14,8 @@
 #include "qthread_p.h"
 #include "private/qcoreapplication_p.h"
 
+#include "../kernel/qthreadawareeventdispatcher_i.hpp"
+
 #include <limits>
 
 QT_BEGIN_NAMESPACE
@@ -111,7 +113,9 @@ void QThreadData::deref()
 
 QAbstractEventDispatcher *QThreadData::createEventDispatcher()
 {
-    QAbstractEventDispatcher *ed = QThreadPrivate::createEventDispatcher(this);
+    QAbstractEventDispatcher *ed = gGlobalEventDispatcher ?
+        gGlobalEventDispatcher :
+        QThreadPrivate::createEventDispatcher(this);
     eventDispatcher.storeRelease(ed);
     return ed;
 }

src/corelib/thread/qthread_win.cpp

@@ -19,6 +19,8 @@
 #endif // _MT
 #include <process.h>
 
+#include "../kernel/qthreadawareeventdispatcher_i.hpp"
+
 QT_BEGIN_NAMESPACE
 
 #if QT_CONFIG(thread)
@@ -327,7 +329,12 @@ void QThreadPrivate::finish(void *arg, bool lockAnyway) noexcept
         if (lockAnyway)
             locker.unlock();
         eventDispatcher->closingDown();
-        delete eventDispatcher;
+        
+        if (gGlobalEventDispatcher != eventDispatcher)
+        {
+            delete eventDispatcher;
+        }
+        
         if (lockAnyway)
             locker.relock();
     }

src/gui/kernel/qaction.cpp

@@ -335,6 +335,16 @@ void QAction::setShortcuts(QKeySequence::StandardKey key)
     setShortcuts(list);
 }
 
+QMenu *QAction::menu2() const
+{
+    return (QMenu *)menuObject();
+}
+
+void QAction::setMenu2(QMenu *m)
+{
+    setMenuObject((QObject *)m);
+}
+
 /*!
     Returns the primary shortcut.
 

src/gui/kernel/qaction.h

@@ -182,18 +182,22 @@ public:
     QMenu *menu() const;
     void setMenu(QMenu *menu);
 #else
-    template<typename T = QMenu*>
+    template<typename T = QMenu *>
     T menu() const
     {
         return qobject_cast<T>(menuObject());
     }
-    template<typename T = QMenu*>
+    template<typename T = QMenu *>
     void setMenu(T m)
     {
         setMenuObject(m);
     }
+
 #endif
 
+    QMenu *menu2() const;
+    void setMenu2(QMenu *m);
+    
     void setIconVisibleInMenu(bool visible);
     bool isIconVisibleInMenu() const;
 

src/gui/kernel/qguiapplication.cpp

@@ -3696,8 +3696,7 @@ void QGuiApplicationPrivate::maybeLastWindowClosed()
     if (!lastWindowClosed())
         return;
 
-    if (in_exec)
-        emit q_func()->lastWindowClosed();
+    emit q_func()->lastWindowClosed();
 
     if (quitOnLastWindowClosed && canQuitAutomatically())
         quitAutomatically();

src/widgets/kernel/qlayout.cpp

@@ -975,7 +975,11 @@ void QLayout::update()
         if (layout->d_func()->topLevel) {
             Q_ASSERT(layout->parent()->isWidgetType());
             QWidget *mw = static_cast<QWidget*>(layout->parent());
-            QCoreApplication::postEvent(mw, new QEvent(QEvent::LayoutRequest));
+            if (mw) { /*we always validate layout later, implying it can be null. why the fuck were the Qt devs copying the [~volatile~] parent multiple times and using it without a check? 
+                       (ok, not volatile - it's usually single threaded, but still two instances of encapsulated access.) */
+                Q_ASSERT(mw->isWidgetType());
+                QCoreApplication::postEvent(mw, new QEvent(QEvent::LayoutRequest));
+            }
             break;
         }
         layout = static_cast<QLayout*>(layout->parent());