guifontwide fonts do not get larger/smaller when guifont does

Steps to reproduce

1. Install and set different fonts for guifont and guifontwide
2. Type in English and Korean: 가나다 ABC
3. Make text larger/smaller

Actual results: only the English text gets larger/smaller; the Korean text stays the same size.

Expected behaviour

Expected results: all text would get larger/smaller

Version of MacVim

r182

MacVim installation method

Downloaded from GitHub release

Environment

macOS version: Sequoia 15.7.3
Mac: MBA M2

Logs and stack traces

Vim and MacVim configuration where issue is reproducable

set guifont=DejaVuSansMono:h20
set guifontwide=D2Coding:h20

Can be reproduced with different guifontwide fonts; one easy-to-get monospaced Korean font is D2Coding-Ver1.3.2-20180524.ttc from https://github.com/naver/d2codingfont/releases/tag/VER1.3.2

How was MacVim launched?

• by launching MacVim.app in macOS (by using the Dock, Spotlight, or the open command)
• by running mvim/gvim in the terminal

Issue has been tested with clean configuration

• by running mvim --clean (or gvim, supplied by MacVim distribution). You can also use the File → "New Clean Window" menu item within MacVim.
• by running vim --clean (in terminal, supplied by MacVim distribution)
• by running vim --clean (in terminal, other suppliers, e.g. /usr/bin/vim)

使用 mvim --clean、所示的 guifont 和 guifontwide 设置，以及混合的韩文和英文文本，在 macOS 上用 MacVim r182 重现该问题。比较两种字体的调整大小行为；当韩文文本与英文文本一起改变大小时，即表示完成。