Consecutive math fractions are too close

[Omikhleia]

Consecutive fractions in math display mode get garbled together, at the risk of being misinterpreted by the reader.

As a workaround, I can manually force a \, in between...

But it's annoying to have to do such manual fine tuning... Can't SILE do better here?

(And yes, the lack of proper square root really shows here, but that's a different issue #1604)

[Omikhleia]

MathML core §3.3.2:

To avoid visual confusion between the fraction bar and another adjacent items (e.g. minus sign or another fraction's bar), a default 1-pixel space is added around the element.

Just sayin'...