Arabic font breaks in iOS app

Question

We work in the iOS application and we use the font "Adobe Arabic" and "Tahoma".

Both fonts are broken in a certain area. for example

Tahoma breaks, adding space between one word, as shown in the image below.

I do not know why this is happening for some work. We have a similar problem for Adobe Arabic for Arabic text.

In most cases, the font breaks when using verses from quran "بسم الل َّ ه الر َّ حم َ ن الر َّ حيم", otherwise this is normal ... This is when we add the tajweed font to add space.

What is the possible reason for this?

Answer 1

, . . ّ:

, .

- . :

// Diacritics
'0x64b' // FatHatan
'0x64c' // Dammatan
'0x64d' // Kasratan
'0x64e' // FatHa
'0x64f' // Damma
'0x650' // Kasra
'0x652' // Sukun
'0x651' // Shadda

, , Uthmani script. .

- , harfbuzz. .

Answer 2

css:

.element {
  letter-spacing: -1px;
}

.