Re: (bug?) wrong interline in \placelist[alternative=d] with Pagella italics

[Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>]

Pablo Rodriguez schrieb am 16.03.2020 um 10:01:
> On 3/15/20 10:56 PM, Wolfgang Schuster wrote:
>> Pablo Rodriguez schrieb am 15.03.2020 um 20:32:
>>> [...]
>>> Everthing is fine when italic fonts aren’t used.
>>
>> It can be fixed with a strut option for lists, e.g.
>> \setuplist[strut=no]. The problem in this case is that the ex-height for
>> the italic font is larger than the ex-height for the upright font which
>> pushes the text down because add a strut at the begin and end of the
>> entries.
> 
> Many thanks for your reply, Wolfgang.
> 
> I don’t get \setuplist[strut=no] working in the minimal sample I sent
> yesterday.

The key isn't supported yet but it could help to avoid the spacing problem.

>> Below is a minimal example of the problem, the \setstrut setting changes
>> the height of the strut for the italic font.
> 
> I must admit that I don’t understand how to handle struts (I’m not sure
> I understand what they actually are.)

The simple answer is that a strut is a invisible vertical line with the 
height and depth of a line. When you look at the example below you can 
see the text in the first box touches the top and bottom boundaries.

When we add a strut at the begin and end of the text we ensure the last 
line has the depth of a normal line and the first line gets the complete 
height of a line.

%%%% begin example
\starttext

\ruledvbox{\samplefile{weisman}}

\blank

\ruledvbox{\begstrut\samplefile{weisman}\endstrut}

\stoptext
%%%% end example

>> Most fonts (I checked only a small number) don't have such a big
>> difference between the ex-height of the upright and italic styles which
>> makes it hard to notice the problem.
> 
> Yesterday I realized that Pagella was an extreme case, because I tried
> to report this issue before, but Latin Modern didn’t show the issue (so
> I thought I was doing something wrong).

Yes, pagella is a extreme case but when you use bold text the vertical 
spacing is also messed up. You can avoid this when you use a fixed 
lineheight (e.g. \setupinterlinespace[line=14pt]) because the default 
distance is font dependant (default: 2.8 * ex-height).

Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________