Fix composition duration for clips at same position/length

src/timeline2/view/timelinecontroller.cpp

@@ -393,7 +393,7 @@ int TimelineController::insertNewComposition(int tid, int clipId, int offset, co
                         revert = position > minimum;
                     }
                 }
-            } else if (position > bottom.first) {
+            } else if (position >= bottom.first) {
                 int test_duration = m_model->getTrackById_const(lowerVideoTrackId)->suggestCompositionLength(position);
                 if (test_duration > 0) {
                     duration = qMin(test_duration, clip_duration);