fixbug 在单元格不可编辑时阻止输入事件并保持原始文本值 #736
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当单元格被标记为不可编辑时( cell.editable === false ), setCell 方法会直接返回而不设置文本。然而, inputEventHandler 中对于不可编辑单元格的处理只是重置输入框的值,这可能导致第一个字符输入时出现异常行为。