Fix active effect not remembered and not correctly focused.

Fixes #854

src/assets/assetpanel.cpp

@@ -451,7 +451,11 @@ void AssetPanel::scrollTo(QRect rect)
 {
     // Ensure the scrollview widget adapted its height to the effectstackview height change
     m_sc->widget()->adjustSize();
-    m_sc->ensureVisible(0, rect.y(), 0, rect.height());
+    if (rect.height() < m_sc->height()) {
+        m_sc->ensureVisible(0, rect.y() + rect.height(), 0, 0);
+    } else {
+        m_sc->ensureVisible(0, rect.y() + m_sc->height(), 0, 0);
+    }
 }
 
 void AssetPanel::slotCheckWheelEventFilter()

src/timeline2/model/clipmodel.cpp

@@ -478,9 +478,13 @@ void ClipModel::refreshProducerFromBin(int trackId, PlaylistState::ClipState sta
         m_producer->parent().set("warp_pitch", 0);
     }
     // replant effect stack in updated service
+    int activeEffect = m_effectStack->getActiveEffect();
     m_effectStack->resetService(m_producer);
     m_producer->set("kdenlive:id", binClip->clipId().toUtf8().constData());
     m_producer->set("_kdenlive_cid", m_id);
+    if (activeEffect > 0) {
+        m_producer->set("kdenlive:activeeffect", activeEffect);
+    }
     m_endlessResize = !binClip->hasLimitedDuration();
 }