V4 Debugger: use engineAdded() instead of engineAboutToBeAdded()

It does not make a difference in functionality, but after engineAdded()
the server won't wait on a mutex anymore. Before this change, if you
managed to send a message to the V4 debugger after the server had
called aboutToBeAdded(), but before it had stopped waiting, you could
produce a deadlock by scheduling an event for the GUI thread that was
never delivered.

This is a cherry-pick of 18c4295e25503ae637a715858de5c94a3d105a92
from 5.7 as apparently the problem also occurs in 5.6.

Change-Id: Ie2343e6da4bd0b8956d41ff8ebd4d7594616ebd1
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

2 files changed, 3 insertions, 3 deletions

diff --git a/src/plugins/qmltooling/qmldbg_debugger/qv4debugservice.cpp b/src/plugins/qmltooling/qmldbg_debugger/qv4debugservice.cpp
index e9bcd772e5..7a9d4a66a4 100644
--- a/src/plugins/qmltooling/qmldbg_debugger/qv4debugservice.cpp
+++ b/src/plugins/qmltooling/qmldbg_debugger/qv4debugservice.cpp
@@ -611,7 +611,7 @@ QV4DebugServiceImpl::~QV4DebugServiceImpl()
     qDeleteAll(handlers);
 }
 
-void QV4DebugServiceImpl::engineAboutToBeAdded(QQmlEngine *engine)
+void QV4DebugServiceImpl::engineAdded(QQmlEngine *engine)
 {
     QMutexLocker lock(&m_configMutex);
     if (engine) {
@@ -628,7 +628,7 @@ void QV4DebugServiceImpl::engineAboutToBeAdded(QQmlEngine *engine)
             }
         }
     }
-    QQmlConfigurableDebugService<QV4DebugService>::engineAboutToBeAdded(engine);
+    QQmlConfigurableDebugService<QV4DebugService>::engineAdded(engine);
 }
 
 void QV4DebugServiceImpl::engineAboutToBeRemoved(QQmlEngine *engine)
diff --git a/src/plugins/qmltooling/qmldbg_debugger/qv4debugservice.h b/src/plugins/qmltooling/qmldbg_debugger/qv4debugservice.h
index 658b1b3998..fafe7d90bf 100644
--- a/src/plugins/qmltooling/qmldbg_debugger/qv4debugservice.h
+++ b/src/plugins/qmltooling/qmldbg_debugger/qv4debugservice.h
@@ -70,7 +70,7 @@ public:
     explicit QV4DebugServiceImpl(QObject *parent = 0);
     ~QV4DebugServiceImpl();
 
-    void engineAboutToBeAdded(QQmlEngine *engine);
+    void engineAdded(QQmlEngine *engine);
     void engineAboutToBeRemoved(QQmlEngine *engine);
 
     void stateAboutToBeChanged(State state);