left-arrow-key on keyboard make the editing cell lose focus and jump to prev cell when i set up a table;This phenomenon is accidental, it is likely to be related to the current cell which get focus by a tab key 中文：键盘上的向左方向键会使正在编辑的单元格失去焦点并将焦点异动到前一个单元格，这中现象是偶然的，很可能跟当前的单元是用tab键跳过来有关
On entering a cell with TAB, the edit cursor is not focused into the cell and movement between cells still has cursor movment control. You must double click the cell to activate edit cursor in the cell--and at which point cursor movement will be within the text or numeric string content of the cell.