let bullet tag define bullet glyph and separate, indented text style about ftcoretext

[algal]

My original comment here referred to two issues:
(1) separate style for the bullet character and for the bullet's text;
(2) bullet text indented according to the usual HTML "list style."

I still believe (1) is in fact a bug, given that the API defines bulletFont and bulletColor, presumably to distinguish it from the text font and text colour of the style, but then in my experiments one overrides the other.

However, as regards (2), I did some digging and realised you can already get this effect using FTCoreText by setting the left value of the paragraphInset to the desired BulletIndent distance. I have to admit I'm quite puzzled why this works.

From experimenting with CoreText directly, I find you can only produce the effect by setting three values (FirstLineHeadIndent=0, TabStop1=BulletIndent, and HeadIndent=BulletIndent) and then beginning the text like "\t". However, from examining the FTCoreText code, and logging the paragraph style with CFShow, I can see that the FTCoreText is only setting two of these values.

I suppose FTCoreText is doing something else, outside of the CTParagraphStyle, that affects layout.