ObjectPicker: ensure pristine pickers are handled

When adding a QObjectPicker component to a QEntity, the object couldn't
actually be picked until one of hoverEnabled, dragEnabled or priority
changed.

This fixes the issue by ensuring notifyJob is called at least once,
when the picker is initialized.

Change-Id: I5b035cf5be6ef1da35c2d24cf76bc2daaad9bc57
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>
(cherry picked from commit 1641eae01636ddb82b668c4f91d2c26f89e5bc06)

2 files changed, 20 insertions, 0 deletions

diff --git a/src/render/picking/objectpicker.cpp b/src/render/picking/objectpicker.cpp
index 341769ce8..07a630857 100644
--- a/src/render/picking/objectpicker.cpp
+++ b/src/render/picking/objectpicker.cpp
@@ -83,6 +83,11 @@ void ObjectPicker::syncFromFrontEnd(const Qt3DCore::QNode *frontEnd, bool firstT
 
     BackendNode::syncFromFrontEnd(frontEnd, firstTime);
 
+    if (firstTime) {
+        markDirty(AbstractRenderer::AllDirty);
+        notifyJob();
+    }
+
     if (node->isHoverEnabled() != m_hoverEnabled) {
         m_hoverEnabled = node->isHoverEnabled();
         markDirty(AbstractRenderer::AllDirty);
diff --git a/tests/auto/render/objectpicker/tst_objectpicker.cpp b/tests/auto/render/objectpicker/tst_objectpicker.cpp
index 24fa2159d..b1898e040 100644
--- a/tests/auto/render/objectpicker/tst_objectpicker.cpp
+++ b/tests/auto/render/objectpicker/tst_objectpicker.cpp
@@ -40,6 +40,21 @@ class tst_ObjectPicker : public Qt3DCore::QBackendNodeTester
     Q_OBJECT
 private Q_SLOTS:
 
+    void checkInitialSync()
+    {
+        // GIVEN
+        TestRenderer renderer;
+        Qt3DRender::Render::ObjectPicker objectPicker;
+        Qt3DRender::QObjectPicker picker;
+
+        // WHEN
+        objectPicker.setRenderer(&renderer);
+        simulateInitializationSync(&picker, &objectPicker);
+
+        // THEN
+        QVERIFY(renderer.dirtyBits() != 0);
+    }
+
     void checkPeerPropertyMirroring()
     {
         // GIVEN