[HTML rendering] Numbers only render in GPU rendering mode in HTML

[leferi99]

Hi! So, in reference to #16, compared to alpha 5, in alpha 6, the numbers display correctly in the reader mode. Also, all the tested paragraphs display correctly in reader mode. However, when using the CPU renderer, the numbers still don't show up in HTML view. When switching to GPU rendering, the HTML text is a bit blurry, but the numbers at least show up, albeit in a very strange way, as if the characters themselves had embedded large whitespace around them.

I am using the AppImage version for the testing, and I do have the 0xProto Nerd Font set in KDE for all fonts, so maybe that has something to do with this issue. I don't quite see why that would affect the number rendering specifically, though.

[iamdarkle]

Thanks for the example, it helped us trace this to a font selection bug in Parley, the text layout library our renderer uses. When the email requests an unavailable font, ordinary digits can incorrectly use an emoji font, causing missing numbers or unusual spacing.

We've applied a local patch, for the next release.

We'll keep this issue open to track the upstream fix and remove our local patch once a compatible Parley release includes it.