I have just installed Manjaro KDE 18.0.4, and the Arabic texts look like that:
It will be a good font to use with wall paintings, but with everyday use, it will be a nightmare. It looks even bigger when browsing websites. This a picture from one of the Arabic comments from this forum:
I changed all fonts to Ubuntu fonts, but it doesn't matter what font I choose, all looks the same with Arabic texts.
I have never had this issue before with previous releases.