On Mac, the posted events are processed on the first time in the loop

On Mac OS X, we use a custom source for posted events.

The first time the event loop is entered, the custom source is added
to the native event dispatcher but the events are not processed. In Qt,
we expect those events to be processed.

To work around the problem, a new observer is added to the event loop.
This observer is only triggered the first time the event loop is
entered. When the observer is triggered, the posted events are sent.

Task-number: QTBUG-4521
Reviewed-by: Richard Moe Gustavsen
Reviewed-by: João Abecasis

1 files changed, 32 insertions, 13 deletions

diff --git a/tests/auto/qcoreapplication/tst_qcoreapplication.cpp b/tests/auto/qcoreapplication/tst_qcoreapplication.cpp
index 9ddd54ae70..4b38044e84 100644
--- a/tests/auto/qcoreapplication/tst_qcoreapplication.cpp
+++ b/tests/auto/qcoreapplication/tst_qcoreapplication.cpp
@@ -47,6 +47,7 @@ class tst_QCoreApplication: public QObject
 {
     Q_OBJECT
 private slots:
+    void sendEventsOnProcessEvents(); // this must be the first test
     void getSetCheck();
     void qAppName();
     void argc();
@@ -59,6 +60,35 @@ private slots:
     void globalPostedEventsCount();
 };
 
+class EventSpy : public QObject
+{
+   Q_OBJECT
+
+public:
+    QList<int> recordedEvents;
+    bool eventFilter(QObject *, QEvent *event)
+    {
+        recordedEvents.append(event->type());
+        return false;
+    }
+};
+
+void tst_QCoreApplication::sendEventsOnProcessEvents()
+{
+    int argc = 1;
+    char *argv[] = { "tst_qcoreapplication" };
+    QCoreApplication app(argc, argv);
+
+    EventSpy spy;
+    app.installEventFilter(&spy);
+
+    QCoreApplication::postEvent(&app,  new QEvent(QEvent::Type(QEvent::User + 1)));
+    QCoreApplication::processEvents();
+    QList<int> expected;
+    expected << QEvent::User + 1;
+    QCOMPARE(expected, spy.recordedEvents);
+}
+
 void tst_QCoreApplication::getSetCheck()
 {
     // do not crash
@@ -114,19 +144,6 @@ void tst_QCoreApplication::argc()
     }
 }
 
-class EventSpy : public QObject
-{
-   Q_OBJECT
-
-public:
-    QList<int> recordedEvents;
-    bool eventFilter(QObject *, QEvent *event)
-    {
-        recordedEvents.append(event->type());
-        return false;
-    }
-};
-
 class EventGenerator : public QObject
 {
     Q_OBJECT
@@ -394,6 +411,8 @@ public:
             }
         case QEvent::User + 1:
             break;
+        default:
+            break;
         }
         return QObject::event(event);
     }