When burning in subtitles from a subtitles XML, the vertical position of lines is inconsistent.

It appears each line of subtitles are vertically aligned based on the bottom of the glyphs in the subtitle, rather than aligning to the "line" position. e.g. "moon" is positioned lower than "your" because the low-hanging descender in "y" pushes "your" up.

The result is that 2-line subtitles have noticeably varying line spacing depending on the content.

e.g.:

moon
your

vs

your
moon

In "moon/your" the 2 lines are pushed close together, in "your/moon" the spacing between them is wide.

This effect is new in 2.16.x. 2.14.x renders subtitles more consistently.

I'm going to produce a full repro case for this, an investigate whether it applies to SRTs as well as subtitles XML, but thought I'd open the issue in the meantime in case it's obvious what's the cause.