On 02/10/11 13:53, Patrick Gundlach wrote:
>>
>>> * in pdftex, \letterspacefont does not disable the ligatures, but this is 
>>> what happens in luatex.
>>
>> IMO that's a desireable behaviour, not a bug. See Bringhurst, Oliver Simon's 
>> _Introduction to Typography_ &c.
>>
>> A control to turn it off or on (defaulting to disabling the ligatures) would 
>> be okay, but I've had to put a lot of effort into turning off ligatures when 
>> letterspacing and it's a pain.
> 
> In older german texts ligatures are not letter spaced. For example:
> 
> B i s m a r ck
> 
> (the ck ligature is not seperated)

Neither was ij in dutch, but ff was separated. Which just goes to show
you that doing letterspacing automatically is hard....
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