I hope to answer a number of observations:
In “instances window” is supposed to be so Display Arabic Fonts.
-No inclusion : dotlesskaf-ar and dotlesskaf-ar.fina in the list of components.
-What is the benefit of this Anchor : caret_1?
That is for caret (=cursor) placement in ligatures. To my knowledge, it only works in TextEdit.
This is Anchor exists with glyphs : lam_alef-ar and lam_alef-ar fina explained to me the way it works here? Please.
the caret_ anchors are used to calculate the ligature caret position: http://partners.adobe.com/public/developer/opentype/index_table_formats5.html scroll down to ‘Ligature Caret List Table’