https://bugs.documentfoundation.org/show_bug.cgi?id=155820

--- Comment #10 from Takenori Yasuda <[email protected]> ---
(In reply to Shinji Enoki from comment #8)
> As shown in the screenshot, the first pair (辺 vs 辺) renders with distinct
> glyph shapes, confirming that IVS works correctly for that character.
> However, the second and third pairs (衞 vs 衞, 今 vs 今) render with the
> identical glyph shape despite the IVS applied to the right-hand character

I believe it is expected that the variant forms of "衞" and "今" are not
displayed with IPAmj Mincho.

It is true that these two characters have variant forms. However, as far as I
know, they are only registered in the Adobe-Japan1 collection.
As I understand it, with IPAmj Mincho, variant forms registered in the
Moji_Joho (文字情報基盤) collection are displayed.

In contrast, "辺" has Moji_Joho variant forms for U+E0101 and U+E0102. As far as
I know, it has no Adobe-Japan1 variant forms for either of them, although one
exists for U+E0100.
Therefore, when the font is changed to Noto Serif CJK JP, the variant forms of
"衞" and "今" are displayed, whereas the variant form of "辺" is not.

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