RFR: 8285308: Win: Japanese logical fonts are drawn with wrong size

[Phil Race]

On Thu, 21 Apr 2022 09:14:14 GMT, Toshio Nakamura <tnakamura at openjdk.org> wrote:

> Japanese logical fonts are drawn with wrong size since Java 18.
> It's triggered by JEP 400, UTF-8 by Default. `sun.awt.FontConfiguration` (and `sun.awt.windows.WFontConfiguration`) seems to expect the native encoding instead of the default encoding. This patch changes to use native encoding.
> 
> Tested: jdk_desktop on Windows, Linux, and macOS

Hmm. I am surprised that the glyphs are actually bigger. Did you come to understand the exact mechanism (steps)
by which this triggers the wrong size ? Without that explanation it isn't apparent to me we've understood the problem
even if this fixes it.

And whilst you tested linux & mac it is a shared code change so it is another reason to understand .. 

And are you sure you can't write a test ? Even something that uses heuristics around the metrics ?

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PR: https://git.openjdk.java.net/jdk/pull/8329