When I run the same file with Amiri:

% !TeX Program=Ini-XeTeX

\catcode `\ = 10
\catcode `\         = 10
\catcode `\{ = 1
\catcode `\} = 2
\catcode `\^ = 7
\font\tenrm="Amiri-Regular.ttf"
\tenrm

\lccode "200D = "200D
\patterns {^^^^200d1^^^^200d}

\def \showhyphens 
        {
                \setbox 0 = \vbox 
                        {
                                \parfillskip = 0 pt 
                                \hsize = \dimen 10
                                \tenrm 
                                \pretolerance = -1
                                \tolerance = -1
                                \hbadness = 0
                                \showboxdepth = 0 \ #1
                        }
        }

\lccode "200D = "200D
\catcode "200D = 11
bla^^^^200d^^^^200dbla
\showhyphens {bla^^^^200d^^^^200dbla}

\end

I get three pages, one with blabla, one with bla and a box, and another with 
bla.
Maybe \showhyphens is not correctly defined in the code above?

> Le 25 mars 2021 à 11:20, Philip Taylor <p.tay...@hellenic-institute.uk> a 
> écrit :
> 
> Philip Taylor wrote:
> 
>> And I see no significant font using Amiri —
> 
> "no significant difference ...".

 <http://www.imt-atlantique.fr/>        Yannis HARALAMBOUS
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