qqmlapplicationengine: Handle errors during component creation

Previously QQmlApplicationEngine did not handle any errors that occurred during object creation
(i.e. failures to initialize required properties) which lead to QObject::connect errors and to
the error messages not getting printed among other issues.

Change-Id: I69bc566a6d349c786cae82a963a621388684c8f5
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
(cherry picked from commit 890cb4cb236333fd5b112fffc0e9088ecb43f2df)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/tests/auto/qml/qqmlapplicationengine/data/requiredViolation.qml b/tests/auto/qml/qqmlapplicationengine/data/requiredViolation.qml
new file mode 100644
index 0000000000..21c29ca6c2
--- /dev/null
+++ b/tests/auto/qml/qqmlapplicationengine/data/requiredViolation.qml
@@ -0,0 +1,3 @@
+import QtQml
+
+Required {}