Spooky October Bugfix

[aaronbell]

Summary of the Pull Request

This is a fairly comprehensive 🐛💀 update resolving many open issues.

PR Checklist

1. Arabic bugfixes

• Closes Missing Arabic positional glyphs #532 👻 - Additional positional variants added
• Closes Wrong hamzas in lam–alef ligatures with U+0672, U+0673, and U+0675 #535 🍂 - Corrected hamza form
• Closes Wrong dots in U+06AE, U+0752, and U+0761 #540 🎃 - Dot arrangement corrected

• Closes U+FBC0 and U+FBBC should be spacing #541 🧹 - Was due to the use of anchors on those glyphs. These have been removed so the glyph can render as spacing.
• Closes Mispositioned U+0670 in “اللّٰه” #542 🌕 - This was partly due to a bug in Harfbuzz. It has been resolved both on the font side (through a different implementation) and in Harfbuzz.
• Closes Wrong glyph for U+0609 ARABIC-INDIC PER MILLE SIGN #549 🦸‍♀️ - Design corrected

• Closes Lam and alef presentation forms should not ligate #555 💀 - All letter glyphs removed from Arabic Presentation form unicode slots to avoid situations where the glyphs are not behaving as expected.

Also:
#543 - uni0615 removed as Cascadia Arabic not intended to support Quranic

2. Other bug fixes

• Closes Some letter ligatures might wrong #488 🔪 - Finally made the www ligature have the proper number of ws.

• Closes == Ligature not working #436 🧟‍♀️ - Extended length of Powerline 'caps' to avoid situations where rounding can prevent overlap. This may cause problems if the caps are used next to one another, but that seems an unlikely scenario given what I've reviewed of Powerline styles.

• Closes Backtick could be more distinct from apostrophe #521 🤖 - enlarged the size of the grave character to make it more recognizable / legible in code.

• Closes Feature Request: Exclamation point clarity at small sizes #524 ☠️ - Added some more differentiation in stroke, and also created more space using hinting.

• Closes Feature Request: Clearer curly braces #525 🧙‍♂️ - tweaked the braces to be more twisty and create better differentiation from the parens.

• Closes Copyright says 2020 in 2021 #529 🧛‍♀️ - Changed year :P
• Closes ij_acute is a mark glyph #546 👹 - ij no longer masquerading as a mark.
• Closes Wrong italic localised Serbian glyph U+0434 #563 🧟‍♂️ - corrected locl feature for proper Serbian rendering

• Closes Italic i's, j's and r's stem top out of blue zone by 1 font unit #571 🦹‍♀️ - corrected overshoot
• Closes Add support for the Unicode Ratio Character ( " ∶ " U+2236 )  #572 🕷 - ratio symbol added
• Closes Thin vertical line box drawing character U+2502 does not fill the line height #577 🍁 - shifted heights of box drawing lines to better align with block glyphs. Will reduce risk of non-joining forms under certain conditions.

[DHowett]

As always, I love it. Thanks!

I might brand this 2110.30 and call it the actual halloween release 😄

[DHowett]

these guideline changes aren't anything to worry about, right?

[aaronbell]

Nah. That's just a guideline. Won't affect anything.

[DHowett]

Woot! Thanks!

[aaronbell]

Seeing all those issues close at once is happy happy 😄 !