runAsync: Fix unexpected behavior for using singleShot/timers etc

Timers/singleShot etc can only be used in QThreads (they require the
event dispatcher). So we have to use QThreads instead of std::threads to
nicely interoperate with Qt features.

Task-number: QTCREATORBUG-15681
Change-Id: I851e2f102e15ccd3347d455cc9d8b7df935c2d5e
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/libs/utils/runextensions.cpp

+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "runextensions.h"
+
+namespace Utils {
+namespace Internal {
+
+RunnableThread::RunnableThread(QRunnable *runnable, QObject *parent)
+    : QThread(parent),
+      m_runnable(runnable)
+{
+}
+
+void RunnableThread::run()
+{
+    m_runnable->run();
+    if (m_runnable->autoDelete())
+        delete m_runnable;
+    deleteLater();
+}
+
+} // Internal
+} // Utils

src/libs/utils/runextensions.h

@@ -27,11 +27,13 @@
 #define RUNEXTENSIONS_H
 
 #include "qtcassert.h"
+#include "utils_global.h"
 
 #include <QCoreApplication>
 #include <QFuture>
 #include <QFutureInterface>
 #include <QRunnable>
+#include <QThread>
 #include <QThreadPool>
 
 #include <chrono>
@@ -618,6 +620,18 @@ private:
     QThread::Priority priority = QThread::InheritPriority;
 };
 
+class QTCREATOR_UTILS_EXPORT RunnableThread : public QThread
+{
+public:
+    explicit RunnableThread(QRunnable *runnable, QObject *parent = 0);
+
+protected:
+    void run();
+
+private:
+    QRunnable *m_runnable;
+};
+
 } // Internal
 
 template <typename ReduceResult, typename Container, typename InitFunction, typename MapFunction,
@@ -665,11 +679,11 @@ template <typename ResultType, typename Function, typename... Args,
               >::type>
 QFuture<ResultType> runAsync(Function &&function, Args&&... args)
 {
-    QFutureInterface<ResultType> futureInterface;
-    futureInterface.reportStarted();
-    std::thread(Internal::runAsyncImpl<ResultType,typename std::decay<Function>::type,typename std::decay<Args>::type...>,
-                futureInterface, std::forward<Function>(function), std::forward<Args>(args)...).detach();
-    return futureInterface.future();
+    auto job = new Internal::AsyncJob<ResultType,Function,Args...>
+            (std::forward<Function>(function), std::forward<Args>(args)...);
+    QFuture<ResultType> future = job->future();
+    (new Internal::RunnableThread(job))->start(); // automatically deletes itself
+    return future;
 }
 
 template <typename ResultType, typename Function, typename... Args>

src/libs/utils/utils-lib.pri

@@ -99,7 +99,8 @@ SOURCES += $$PWD/environment.cpp \
     $$PWD/categorysortfiltermodel.cpp \
     $$PWD/dropsupport.cpp \
     $$PWD/icon.cpp \
-    $$PWD/port.cpp
+    $$PWD/port.cpp \
+    $$PWD/runextensions.cpp
 
 win32:SOURCES += $$PWD/consoleprocess_win.cpp
 else:SOURCES += $$PWD/consoleprocess_unix.cpp

src/libs/utils/utils.qbs

@@ -166,6 +166,7 @@ QtcLibrary {
         "qtcprocess.h",
         "reloadpromptutils.cpp",
         "reloadpromptutils.h",
+        "runextensions.cpp",
         "runextensions.h",
         "savedaction.cpp",
         "savedaction.h",

tests/auto/runextensions/runextensions.pro

+QTC_LIB_DEPENDS = utils
 include(../qttest.pri)
 
 # Input

tests/auto/runextensions/runextensions.qbs

@@ -2,7 +2,7 @@ import qbs
 
 QtcAutotest {
     name: "Run extensions autotest"
-    cpp.includePaths: base.concat(project.ide_source_tree + "/src/libs")
+    Depends { name: "Utils" }
 
     files: [
         "tst_runextensions.cpp",