Overline in DOM renderer doesn't show depending on the font

[Tyriar]

Current vertical-align: top

It works with vertical-align: middle, maybe that's the workaround? I wouldn't be surprised if it hid the underlines in this case though

[jerch]

I also stumbled over this in the faster renderer PR, the problem is basically rounding issues in the dimension calc, which leads to edge cases, where the row is simply not high enough to show all decorations done by the browser.

This would also get fixed by an inline rework, which I did not deal with yet in the PR (postponed).