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How would you draw a `AnnotationString` span on a angle? Rotation doesn't seem to be available on `SpanStyle` .. can I have custom rendering for a given span? (Or maybe some other technique?)

One option is to use `onTextLayout`'s result to find the bounding box for that text, then use `drawBehind` to draw the tilted box. Though this will introduce a one frame delay to the highlight drawing.

It shouldn’t have a delay - text measurement happens during the compose measure phase, before draw. 

`onTextLayout` that is the `Text` parameter, right? i.e. I should not go the `AnnotatedString`/span route?

Or should I use Spans as indices markers and pick them up somehow in `onTextLAyout`?

Using `onTextLayout {}` should give you a `TextLayoutResult` that contains queryable information about the rendered text. Look into `TextLayoutResult.getBoundingBox(…)` to find the bounding box for your desired text run. Not sure if you will need `AnnotatedString` anymore if you are going to manually draw your angled highlight… depends if you have a need for additional “annotation” that you don’t want to manually draw on the canvas.