[ho-tex] vertical spacing with amsmath+fleqn+hyperref

[David Carlisle]

see
http://tex.stackexchange.com/questions/309096/inconsistent-vertical-space-after-first-beginequation/309099#comment750929_309099

for discussion of related issues

David


On 16 May 2016 at 23:14, Reinhard Kotucha <reinhard.kotucha at web.de> wrote:
> On 2016-05-15 at 09:30:09 +0100, David Carlisle wrote:
>
>  > On 14 May 2016 at 23:38, Reinhard Kotucha <reinhard.kotucha at web.de> wrote:
>
>  >> BTW, even without hyperref, vertical spacing doesn't look correct.
>  >> When amsmath is used *and* the fleqn option is set, there is more
>  >> vertical space between the first and second equation than between
>  >> others.  But this is certainly an amsmath issue and unrelated here.
>
>  > Note however that it is always wrong to have a display math at the
>  > start of a paragraph or immediately after another you get spurious
>  > "white" paragraphs in that case,
>
> But even without hyperref, spacing is correct unless the fleqn option
> is set.
>
> I just noticed that spacing is also incorrect when I omit the fleqn
> option and set \textwidth=3cm.  Maybe amsmath doesn't take \hsize into
> account properly.  What I don't understand is why the extra vertical
> space is only added between the first and second equation and spacing
> is as expected anywhere else.
>
>  > but it would be good if hyperref didn't change spacing anyway.
>
> It doesn't deliberately, as far as I understand.  It adds hyperlinks
> to equation numbers.  hyperlinks are whatsits and whatsits have an
> impact on line breaks.  So hyperref has to fix all these undesired
> line breaks and amsmath's fleqn option is simply not supported yet.
>
>  > Unlikely to get to this before the for first TL2016 cutoff (code
>  > too risky to attempt to change in that timeframe!)
>
> David, I never expected a solution in the near future.  But I'm very
> glad that you are investigating at all.  Since only macro packages are
> involved, everything can be updated easily when TL-2016 is released.
>
> Regards,
>   Reinhard
>
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