bug#56695: AW: bug#56695: A new and old font problem with Arabic

[address@hidden]

Unfortunately I have another question.

Is it possible to force emacs to re-position the characters/glyphs?

It doesn't help to re-open the file.
The command:
(set-fontset-font "fontset-default" 'arabic "ANOTHER FONT") 
helps only for one-time. After some typing re-using the command doesn't help.

This command:
M-: (clear-composition-cache) RET
seems to change something but it doesn't help.

Somehow Emacs seems to remember the false positioning of the characters.
If I a start a new Emacs the problem disappears (for some time, as I said).

So how can I let Emacs "forget" the false positioning and make a new one?