Kashida with XePersian and XB Series Font

Question

I am using xepersian and XB Niloofar font to produce Farsi documents. When enabling [Kashida] option, although XB Niloofar has the kashida (U+0640) glyph, I get a fuzzy output. Any solution?

\documentclass[12pt]{article}
\usepackage[Kashida]{xepersian}
\settextfont[Scale=1]{XB Niloofar}
\setdigitfont[Scale=1]{XB Niloofar}
\setlatintextfont[Scale=0.9]{Junicode}

\begin{document}
سلام، من هر روز به مدرسه می‌روم. 
بایستی به قدری بنویسم که تراز کردن 
اتفاق بیفتد و از کشیده استفاده شود. 
این کشــــــــیــــــــــده است؟
\end{document}

Answer 1

XePersian seems to be inserting a horizontal rule not the kashida glyph regardless of the presence or absence of kashida in the font used (that what I see from the code).

Rules are rendered slightly differently from actual glyphs, which results in the fuzziness you see.