[xep-support] Footnote causing gap between lines

[Nikolai Grigoriev]

Gustaf,

> Here's something that I've never been able to solve completely. 
> The footnote number is causing an ugly gap in the text. 

I know two ways to cope with the problem.

1) You can disable line spacing adjustment for all subscripts
and superscripts _in the block that contains the footnote_, 
by setting line-height-shift-adjustment="disregard-shifts".
The property is inheritable, so if you like this behaviour
to be the default one, just add the attribute to fo:root.

2) Alternatively, you can force text-altitude on footnote
numbers to be zero:

<fo:footnote>
    <fo:inline baseline-shift="super" font-size="5pt" 
               text-altitude="0">
        <xsl:value-of select="$footnote-number"/>
     </fo:inline>
     <fo:footnote-body>
         ...

This will work only for superscripts, and only if the shifted
baseline is lower than the ascender of the main text - that is, 
in 99,9% of real-life cases :-). The method is less universal
than the previous one, but may be easier to use in complex 
stylesheets because changes are perfectly local.

Regards,
Nikolai
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