Possibly variant for ầ, ề and ồ

[KrasnayaPloshchad]

I have seen that ầ, ề and ồ may have unusual design that placed grave accent at top right of circumflex. Maybe it’s resonable to implement as character variant feature.

See: https://www.bilibili.com/video/BV1E54y1W7x1

[frankrolf]

Ha, I could have sworn this was already the case – in fact the grave accents overhanging on the left side create spacing challenges, and require kerning exceptions. Maybe some overhaul is in order.
Putting this on my list of future improvements.

See also adobe-fonts/source-sans#232

[erkinalp]

It’s not unusual at all. In fact, it’s the preferred alignment for legibility, according to https://vietnamesetypography.com/design-challenges/