From: Peter Kirk (peterkirk@qaya.org)
Date: Wed Sep 15 2004 - 04:14:59 CDT
On 15/09/2004 04:02, Peter Constable wrote:
> ...
>
>IIRC, the scenario of IL *not* followed by a combining mark was not one
>explicitly discussed by the proposers before preparing their proposal. I
>would consider it a possibility that the advance width could be in
>proportion to the width of the combining mark; it might be considered a
>logical extension of that idea to say that the advance width could
>reduce to 0 in the event the maximum width of marks combining with the
>IL were 0 (i.e. there are no visible combining marks), but that was not
>a specific intent of the proposal.
>
>
>
The particular case when a reduction to zero width would be especially
appropriate is when INVISIBLE LETTER is used with a *spacing* combining
mark, so that this can be displayed in isolation, with no leading space
i.e. correctly aligned with a margin or column. This is particularly
necessary in tables of alphabets etc, in which all of the characters in
a writing system, including those which Unicode has defined as spacing
combining marks, are displayed in a table. (Yes, correct display of
tables is outside the scope of plain text, but it is not the job of
markup to delete extra space which has been generated by Unicode.)
-- Peter Kirk peter@qaya.org (personal) peterkirk@qaya.org (work) http://www.qaya.org/
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