That's it! Many thanks to Hans, Hraban and especially Wolfgang for his 
solution. This environment should become part of ConTeXt!

I have been a LaTeX/XeTeX/LuaLaTeX user for over 30 years and used it to 
write my papers during my studies and use it for almost all my writing.
Now I wanted to try ConTeXt and will be glad if anyone can help me. As I 
said, I am only a user.

Many thanks and best regards
Thomas


Am 22.01.24 um 20:24 schrieb Wolfgang Schuster:
> Thomas Meyer schrieb am 22.01.2024 um 13:04:
>>
>>
>> Am 22.01.24 um 12:06 schrieb Henning Hraban Ramm:
>>> Am 22.01.24 um 11:46 schrieb Thomas Meyer:
>>>> I might get a bit impatient if I have the impression that others 
>>>> get an answer faster. Sorry for that.
>>>
>>> It’s not unusual to get that impression. It depends on the current 
>>> attention, capacity and mood of the few who can answer your questions.
>>>
>>>> So the problem is still \hfill that the last paragraph is not on 
>>>> grid in the new and the old version (and comma).
>>>
>>> Grid is not as easy as it looks first. Low level tricks like fills 
>>> or skips can mess it up.
>>>
>>>
>>> Maybe \startlinecorrection helps… (No, it doesn’t.)
>>>
>>> It also doesn’t help to add a \blank or \par after \vfill.
>>
>> I know it, i tried it. And I tried \snaptogrid \vbox {}, it doesn't 
>> work too.
>>
>> Only counting empty rows and set the number in \blank[ *big] works!
>
>
> You need a fixed space (multiple of the line distance) between the 
> text blocks and \vfill is a variable space which isn't what you want 
> here.
>
> TO get the desired space between the blocks you have to measure the 
> height of the text at the bottom and calculate the number of lines 
> which have to be added in the gap. Below is a simple solution which 
> adds the required number of \blank lines.
>
> \def\PlaceAtBottom
>   {\par
>    \dowithnextbox
>       {\scratchdimen\dimexpr\pagegoal-\pagetotal\relax
>        \ifdim\nextboxht>\scratchdimen
>          \page
>          \getnoflines{\dimexpr\textheight-\nextboxht\relax}%
> \dontleavehmode\blank[\number\numexpr\noflines-2\relax*line]%
>          \unvbox\nextbox
>        \else
>          \getnoflines{\dimexpr\scratchdimen-\nextboxht\relax}%
>          \blank[\number\numexpr\noflines-1\relax*line]%
>          \unvbox\nextbox
>        \fi}
>       \vbox}
>
> \let\stopPlaceAtBottom\egroup
>
> \def\startPlaceAtBottom
>   {\PlaceAtBottom\bgroup}
>
> \mainlanguage[de]
> \setupbodyfont[libertinus, 12pt]
>
> \setuppagenumbering
>   [location={footer,middle}]
>
> \setuplayout
>   [grid=yes]
>
> \showgrid
>
> \starttext
>
> \samplefile{lorem}
>
> \startPlaceAtBottom
> {\sl\samplefile{lorem}}
> \stopPlaceAtBottom
>
> \page
>
> \dorecurse{4}{\samplefile{lorem}}
>
> \startPlaceAtBottom
> {\sl\samplefile{lorem}}
> \stopPlaceAtBottom
>
> \stoptext
>
> Wolfgang
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