When using the system input method to input Chinese, deleting the input character will crash when the last character is deleted.
crash info：
reason:NSMutableRLEArray objectAtIndex:effectiveRange:: Out of bounds
-[WKContentView(WKInteraction) setAttributedMarkedText:selectedRange:]_block_invoke
-[WKContentView(WKInteraction)
objc_msgSend$attributesAtIndex:effectiveRange:
（像是WebKit处理系统输入法删除输入信息时，处理文本编辑的问题）
Summer666
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