Mark to base bug

[charbelabousawan]

First of all, thank you for creating this beautiful typeface.
I spotted the following bugs in the Arabic text shaping of the Estedad font version 8.5
Mark to mark issues:
When adding Arabic mark U+FE74 Kasratan after Shadda, as you can see, it's mispositioned it should be below Shadda, not above it, plus the shadda is colliding with all Arabic Letters.

[aminabedi68]

thank you for your favor and to make this detailed issue.
yes, i could reproduce it and confirm the issue. I'll fix it on the next update.