Suppress transient errors from bindings

If a binding generates > 1 transient error, only the first was being
suppressed.

QTBUG-10274

3 files changed, 34 insertions, 1 deletions

diff --git a/src/declarative/qml/qdeclarativeexpression.cpp b/src/declarative/qml/qdeclarativeexpression.cpp
index f561a7e..5ceb918 100644
--- a/src/declarative/qml/qdeclarativeexpression.cpp
+++ b/src/declarative/qml/qdeclarativeexpression.cpp
@@ -57,10 +57,12 @@ QT_BEGIN_NAMESPACE
 
 bool QDeclarativeDelayedError::addError(QDeclarativeEnginePrivate *e)
 {
-    if (!e || prevError) return false;
+    if (!e) return false;
 
     if (e->inProgressCreations == 0) return false; // Not in construction
 
+    if (prevError) return true; // Already in error chain
+
     prevError = &e->erroredBindings;
     nextError = e->erroredBindings;
     e->erroredBindings = this;
diff --git a/tests/auto/declarative/qdeclarativeecmascript/data/transientErrors.2.qml b/tests/auto/declarative/qdeclarativeecmascript/data/transientErrors.2.qml
new file mode 100644
index 0000000..a36b4c0
--- /dev/null
+++ b/tests/auto/declarative/qdeclarativeecmascript/data/transientErrors.2.qml
@@ -0,0 +1,14 @@
+import Qt 4.7
+
+QtObject {
+    id: root
+
+    property variant a: 10
+    property int x: 10
+    property int test: a.x
+
+    Component.onCompleted: {
+        a = 11;
+        a = root;
+    }
+}
diff --git a/tests/auto/declarative/qdeclarativeecmascript/tst_qdeclarativeecmascript.cpp b/tests/auto/declarative/qdeclarativeecmascript/tst_qdeclarativeecmascript.cpp
index 491a736..6cde46b 100644
--- a/tests/auto/declarative/qdeclarativeecmascript/tst_qdeclarativeecmascript.cpp
+++ b/tests/auto/declarative/qdeclarativeecmascript/tst_qdeclarativeecmascript.cpp
@@ -1149,6 +1149,7 @@ static void transientErrorsMsgHandler(QtMsgType, const char *)
 // Check that transient binding errors are not displayed
 void tst_qdeclarativeecmascript::transientErrors()
 {
+    {
     QDeclarativeComponent component(&engine, TEST_FILE("transientErrors.qml"));
 
     transientErrorsMsgCount = 0;
@@ -1160,6 +1161,22 @@ void tst_qdeclarativeecmascript::transientErrors()
     qInstallMsgHandler(old);
 
     QCOMPARE(transientErrorsMsgCount, 0);
+    }
+
+    // One binding erroring multiple times, but then resolving
+    {
+    QDeclarativeComponent component(&engine, TEST_FILE("transientErrors.2.qml"));
+
+    transientErrorsMsgCount = 0;
+    QtMsgHandler old = qInstallMsgHandler(transientErrorsMsgHandler);
+
+    QObject *object = component.create();
+    QVERIFY(object != 0);
+
+    qInstallMsgHandler(old);
+
+    QCOMPARE(transientErrorsMsgCount, 0);
+    }
 }
 
 // Check that errors during shutdown are minimized