lineannotation indentation

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Hi,

http://docbook.org/tdg/en/html/lineannotation.html

If several LineAnnotations occur in the same listing, they may be
aligned horizontally.

it does not look like this "Processing expectation" is met (yes, "may"
above implies that this is not a requirement).
Still, it would be a nice feature...
see http://clisp.podval.org/impnotes/compilation.html#semantic-constraints
where I use tabs in my customization layer to simulate this.

Sam.
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