QQmlApplicationEngine: Yet another fix after QUrl behavior changes in QtBase

Picture the following application:
    QQmlApplication qAppEngine("main.qml");

With main.qml:
    ...
    AComponentInTheSameDirectory {
    }
    ...

This was failing, with the error:
    file:main.qml:13 AComponentInTheSameDirectory is not a type

Which is wrong, but also reveals the root cause in that the
original filename was not a fully resolved path.

Change-Id: Ifc5557cc43f4bb92fd121ea9f7a37f09b3b38a9b
Reviewed-by: David Faure <david.faure@kdab.com>

src/qml/qml/qqmlapplicationengine.cpp

@@ -190,9 +190,14 @@ void QQmlApplicationEnginePrivate::_q_finishLoad(QObject *o)
 /*!
   \fn QQmlApplicationEngine::objectCreated(QObject *object, const QUrl &url)
 
-  This signal is emitted when an object finishes loading. If loading was successful, \a object contains a pointer to the loaded object.
-  Otherwise the pointer is NULL. The \a url loaded is also provided, note that if a QString file path was initially passed to the
-  QQmlApplicationEngine, this url will be the equivalent of QUrl::fromLocalFile(filePath).
+  This signal is emitted when an object finishes loading. If loading was
+  successful, \a object contains a pointer to the loaded object, otherwise
+  the pointer is NULL.
+
+  The \a url to the component the \a object came from is also provided.
+
+  \note If the path to the component was provided as a QString containing a
+  relative path, the \a url will contain a fully resolved path to the file.
 */
 
 /*!
@@ -226,7 +231,7 @@ QQmlApplicationEngine::QQmlApplicationEngine(const QUrl &url, QObject *parent)
   This is provided as a convenience, and is the same as using the empty constructor and calling load afterwards.
 */
 QQmlApplicationEngine::QQmlApplicationEngine(const QString &filePath, QObject *parent)
-    : QQmlApplicationEngine(QUrl::fromLocalFile(filePath), parent)
+    : QQmlApplicationEngine(QUrl::fromUserInput(filePath, QLatin1String("."), QUrl::AssumeLocalFile), parent)
 {
 }
 
@@ -265,7 +270,7 @@ void QQmlApplicationEngine::load(const QUrl &url)
 void QQmlApplicationEngine::load(const QString &filePath)
 {
     Q_D(QQmlApplicationEngine);
-    d->startLoad(QUrl::fromLocalFile(filePath));
+    d->startLoad(QUrl::fromUserInput(filePath, QLatin1String("."), QUrl::AssumeLocalFile));
 }
 
 /*!

tests/auto/qml/qqmlapplicationengine/data/LocalComponent.qml

@@ -0,0 +1,6 @@
+import QtQml 2.0
+
+// used in nonResolvedLocal
+QtObject {
+
+}

tests/auto/qml/qqmlapplicationengine/data/nonResolvedLocal.qml

@@ -0,0 +1,9 @@
+import QtQml 2.0
+
+QtObject {
+    property bool success: true
+
+    property QtObject local: LocalComponent {
+    }
+}
+

tests/auto/qml/qqmlapplicationengine/tst_qqmlapplicationengine.cpp

@@ -42,6 +42,7 @@ public:
 private slots:
     void initTestCase();
     void basicLoading();
+    void testNonResolvedPath();
     void application();
     void applicationProperties();
 private:
@@ -83,6 +84,29 @@ void tst_qqmlapplicationengine::basicLoading()
     delete test;
 }
 
+// make sure we resolve a relative URL to an absolute one, otherwise things
+// will break.
+void tst_qqmlapplicationengine::testNonResolvedPath()
+{
+    {
+        // NOTE NOTE NOTE! Missing testFileUrl is *WANTED* here! We want a
+        // non-resolved URL.
+        QQmlApplicationEngine test("data/nonResolvedLocal.qml");
+        QCOMPARE(test.rootObjects().size(), 1);
+        QVERIFY(test.rootObjects()[0]);
+        QVERIFY(test.rootObjects()[0]->property("success").toBool());
+    }
+    {
+        QQmlApplicationEngine test;
+        // NOTE NOTE NOTE! Missing testFileUrl is *WANTED* here! We want a
+        // non-resolved URL.
+        test.load("data/nonResolvedLocal.qml");
+        QCOMPARE(test.rootObjects().size(), 1);
+        QVERIFY(test.rootObjects()[0]);
+        QVERIFY(test.rootObjects()[0]->property("success").toBool());
+    }
+}
+
 void tst_qqmlapplicationengine::application()
 {
     /* This test batches together some tests about running an external application