brill.com/view/title/239…
Déroche repeatedly says the Arabic script was 'adapted' to scriptia continua.
en.wikipedia.org/wiki/Scriptio_…
islamic-awareness.org/history/islam/…
islamic-awareness.org/history/islam/…
It is true, all Hijazi Qurans are written in scriptio continua, e.g. BL Or. 2165 and BnF Arabe 328a.
bl.uk/manuscripts/Fu…
gallica.bnf.fr/ark:/12148/btv…
gallica.bnf.fr/ark:/12148/btv…
gallica.bnf.fr/ark:/12148/btv…
gallica.bnf.fr/ark:/12148/btv…
gallica.bnf.fr/ark:/12148/btv…
gallica.bnf.fr/ark:/12148/btv…
gallica.bnf.fr/ark:/12148/btv…
Leiden Universiteitbibliotheek Or. 228.
…online.com.ezproxy.leidenuniv.nl:2048//browse/memo-1… (no open acces; sorry).
Throughout the entire written history, the Arabic script didn't have spaces.
gallica.bnf.fr/ark:/12148/btv…
gallica.bnf.fr/ark:/12148/btv…
The assumption that Arabic script "should" work like that is anachronistic.