[Bug 50880] New: Japanese fonts and font substitution

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50880

Bug ID: 50880
           Summary: Japanese fonts and font substitution
           Product: Wine
           Version: 6.5
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: gdi32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

I'm not sure if this qualifies as a bug or not.

I ran across a game that was meant to use a bundled font, but due to a typo in
the bug resources was using the fallback font instead.

This cased the spacing to be more than a little off.

That of itself would be somewhat annoying, but not really a wine bug.

Yet, I've managed to find a Windows screenshot.

A typo stays a typo, so *a* fallback was used there too.

The thing is, going by the shape of one of kana glyphs I'm strongly convinced
System font was used as the fallback - more exactly MS UI Gothic.

This raises two questions:

- perhaps wine should check System font for glyphs before going for fontconfig
fallback ?

- there's an additional problem with any potential MS UI Gothic substitute;
both 'IPAMona UI Gothic' (which is advertised as metric-compatible substitute)
and Source Han (which isn't but is one of more popular free cjk fonts) have
U+3000 (ideographic space) as a square...in MS UI Gothic, it's a 2:3 rectangle
(roughly);
given its width that leads to quite significant differences in spacing; besides
that Source Han is effectively monospaced for cjk glyphs (despite no Panose
marking), while MS UI Gothic isn't (in regard of cjk interpunction mostly); so,
is there any free font that actually *is* metric-compatible with MS UI Gothic ?