Ensure frame position consistency for out operations.

Related to #318

src/monitor/monitor.cpp

@@ -686,7 +686,7 @@ void Monitor::slotSetZoneEnd(bool discardLastFrame)
 {
     Q_UNUSED(discardLastFrame);
     int pos = m_glMonitor->getCurrentPos();
-    if (m_controller == nullptr) {
+    if (m_controller) {
         pos++;
     }
     m_glMonitor->getControllerProxy()->setZoneOut(pos);

src/timeline2/view/timelinecontroller.cpp

@@ -799,7 +799,7 @@ void TimelineController::setOutPoint()
             if (start + m_model->getItemPlaytime(id) == cursorPos) {
                 continue;
             }
-            int size = cursorPos - start + 1;
+            int size = cursorPos - start;
             m_model->requestItemResize(id, size, true, true, 0, false);
             selectionFound = true;
         }
@@ -815,7 +815,7 @@ void TimelineController::setOutPoint()
             if (cid >= 0) {
                 int start = m_model->getItemPosition(cid);
                 if (start + m_model->getItemPlaytime(cid) != cursorPos) {
-                    int size = cursorPos - start + 1;
+                    int size = cursorPos - start;
                     m_model->requestItemResize(cid, size, true, true, 0, false);
                 }
             }