Fix cannot move clip left when only 1 frame space

src/timeline2/model/timelinemodel.cpp

@@ -837,6 +837,7 @@ bool TimelineModel::requestClipMove(int clipId, int trackId, int position, bool
             Q_ASSERT(undone);
             qWarning() << "clip deletion failed";
             return false;
+        } else {
         }
     }
     ok = ok && getTrackById(trackId)->requestClipInsertion(clipId, position, updateView, finalMove, local_undo, local_redo, groupMove, allowedClipMixes);

src/timeline2/model/trackmodel.cpp

@@ -147,7 +147,7 @@ Fun TrackModel::requestClipInsertion_lambda(int clipId, int position, bool updat
     if (auto ptr = m_parent.lock()) {
         Q_ASSERT(ptr->getClipPtr(clipId)->getCurrentTrackId() == -1);
         target_playlist = ptr->getClipPtr(clipId)->getSubPlaylistIndex();
-        length = ptr->getClipPtr(clipId)->getPlaytime();
+        length = ptr->getClipPtr(clipId)->getPlaytime() - 1;
         /*if (target_playlist == 1 && ptr->getClipPtr(clipId)->getMixDuration() == 0) {
             target_playlist = 0;
         }*/