Investigate comparison between pos and index in NSTextStorage+VimOperation.m

[yixiang]

In [NSTextStorage xvim_firstOfLine], there is a comparison between pos and index (pos == index).

pos is a position in terms of characters but index is line the line number. It definitely feels wrong to compare them, but I was not able to figure out what the expected behavior is with my time constraints. So I'm going to leave that to those who are more familiar with the code.

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[tidbeck]

Isn't index the position in the text to start searching from and pos the position for the start of the same line?