Move the dragged node when the left mouse button is used.
当按住鼠标左键拖动节点时移动节点。
When the left slider has the focus, the arrow keys will move the starting boundary of the zoom window by 1 interval left or right.
当焦点在左滑块上时，箭头键会按1个间隔向左或向右移动缩放窗口的起始边界。
When the left slider has the focus, the arrow keys will move the starting boundary of the zoom window by 1 interval left or right.
当焦点在左滑块上时，箭头键会按1个间隔向左或向右移动缩放窗口的起始边界。
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