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David Given wrote:
> I want to write a text editor, and so there'll be lots of 
> nasty fetch-the-character-from-column-Z issues. Assuming each 
> grapheme cluster renders into a single character cell --- 
> which I know is not strictly valid, as some clusters will 
> occupy multiple cells --- then dealing with character offsets 
> instead of byte offsets will make life much easier.

Also keep in mind that many Unicode characters are meant to be combined with others (`+E gives È for example), and as such you will have multiple unicode codepoints for a single grapheme (and a single character cell). Character offset in unicode strings don't reflect grapheme offset in the string graphical representation, even with fixed width fonts.