Regression: Text properties for part of the word break Arabic shaping

As in the title. If text properties (like bold, italic and underline) are applied to a part of an Arabic word, the shaping brakes.
This is important for fixing accelerators in Arabic text.

Text used: "م<b>وس</b>وعة م<u>شارك</u>ات ال<i>مجتم<i>ع"
Font: Doesn't matter

Attached two screenshots from Qt Designer 5.7 and 4.8.
And one for the accelerators in Qt Linguist (not 5.7, but the same happens in 5.7).