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when ImageSpan is the first span, dx calculation error.
当 ImageSpan 作为第一个 span 时,dx 看起来计算不对,会遮挡后面的 span。
修复之前:

修复之后:

可能原因:
问题出在以下这些代码:
当 textOffset = 0 时,也就是第一个 span 是 ImageSpan,dx 应该等于 0,当调用
getOffsetForCaret()
后,offsetForCaret.dx
大于 0,所以导致第一个 ImageSpan 绘制到后面的 span 上了。