func (bh *BufferHist) snapshot(buff buffer.Buffer, mc cursor.MultiCursor) {
curBuf, curMC := bh.Current()
curRow := curMC.GetRow(0)
newRow := mc.GetRow(0)
if curRow-newRow > 5 || newRow-curRow > 5 {
state := NewBufferState(curBuf, mc)
bh.elemMutex.Lock()
bh.element = bh.list.InsertAfter(state, bh.element)
bh.elemMutex.Unlock()
}
state := NewBufferState(buff, mc)
bh.elemMutex.Lock()
bh.element = bh.list.InsertAfter(state, bh.element)
bh.elemMutex.Unlock()
bh.trim()
}
