Hans Hagen schrieb am 28.08.18 um 10:14:
> On 8/28/2018 3:49 AM, Henri Menke wrote:
>> Dear list,
>>
>> In the latest beta the font fallback using a text font in math mode does
>> not work anymore.  The log contains messages like
>>
>> char 𝑐 (U+1D450) in font 'MinionPro-It' with id 8: missing
>> char 𝑎 (U+1D44E) in font 'MinionPro-It' with id 8: missing
>> char 𝑏 (U+1D44F) in font 'MinionPro-It' with id 8: missing
>>
>> which is not surprising because a text font does not have math italics.
>> How can I get this to work again?  MWE below.
>
> Isn't it
>
> \definefallbackfamily
>     [mainface] [math] [Minion Pro]
>     [range=lowercaseitalic,force=yes]
> \definefallbackfamily
>     [mainface] [math] [Minion Pro]
>     [range=digitsnormal,force=yes]
>
> or so? It's Wolfgangs speciality ...

\definefallbackfamily [mainface] [math] [Minion Pro] 
[preset=math:lowercaseitalic,force=yes]
\definefallbackfamily [mainface] [math] [Minion Pro] 
[preset=math:digitsnormal,force=yes]


but there is a bug in the fallback mechanism when you try to replace 
characters which
are in different positions, e.g. mathitalic lowercase a (0x1D44E) with 
upright lowercase a (0x61).

Attached is a test file where I tried to replace the uppercase and 
lowercase mathitalic b
with a letter from a text font but it doesn’t work.

Wolfgang