In Liberation Sans the underline for the bold variants is lower as it is with the non-bold variants which causes interference with the next line if lines are dense:
Furthermore it looks strange when using iText to render PDFs as it uses the configured underline position for each variant as is (other text processor like Word and Pages do some kind of unification):
With reference font Arial the underlines in bold variants are top-aligned to the non-bold ones. We tweeked the bold variants of Liberation Sans ourself with FontForge ("Underline Position") to also be top-aligned and then it looks fine.
Is this how it should be ?
This does not match metrics of reference font Times New Roman (OS: Windows 10)
Probably this problem is related to this issue.
In Liberation Sans the underline for the bold variants is lower as it is with the non-bold variants which causes interference with the next line if lines are dense:
Furthermore it looks strange when using iText to render PDFs as it uses the configured underline position for each variant as is (other text processor like Word and Pages do some kind of unification):
With reference font Arial the underlines in bold variants are top-aligned to the non-bold ones. We tweeked the bold variants of Liberation Sans ourself with FontForge ("Underline Position") to also be top-aligned and then it looks fine.