Monospace diacritics add space after glyph

[FlorianPircher]

Set the glyph properties of your custom marks to be of category Mark and subcategory Nonspacing with Edit → Info for Selection…, like so:

Or use a custom GlyphData.xml file, see the recent topic here:

Adding Glyphs for Arabic Symbols

The glyph names and how they behave (their glyph properties) are defined a big file called GlyphData.xml. Here is what the line for bismillah-ar looks like: Here, you can see the name of the glyph and its properties such as the Unicode code point, the category, script, and writing direction. And here are allahlong-ar and jallajalalouhou-ar. For these, the Unicode code point is marked as legacy and the category is Letter, not Symbol. I am not sure if these differences are intensional or hi…