[Bug 2025651] Re: default Japanese font in snap apps is ugly

[Mitsuya Shibata]

Inspired by
https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/2017076/comments/35

Mantic:
$ snap run --shell firefox
$ LC_CTYPE=ja_JP.UTF-8 fc-match -s sans-serif | head
DroidSansFallbackFull.ttf: "Droid Sans Fallback" "Regular"
DejaVuSans.ttf: "DejaVu Sans" "Book"
DejaVuSans-Bold.ttf: "DejaVu Sans" "Bold"
KhmerOS.ttf: "Khmer OS" "Regular"
NimbusSans-Regular.otf: "Nimbus Sans" "Regular"
Loma.ttf: "Loma" "Regular"
Waree.ttf: "Waree" "Regular"
Umpush-Bold.ttf: "Umpush" "Bold"
Laksaman.ttf: "Laksaman" "Regular"
NotoSansCJK-Regular.ttc: "Noto Sans CJK JP" "Regular"

Jammy:
$ snap run --shell firefox
$ LC_CTYPE=ja_JP.UTF-8 fc-match -s sans-serif | head
NotoSansCJK-Regular.ttc: "Noto Sans CJK JP" "Regular"
DejaVuSans.ttf: "DejaVu Sans" "Book"
DejaVuSans-Bold.ttf: "DejaVu Sans" "Bold"
NimbusSans-Regular.otf: "Nimbus Sans" "Regular"
Lohit-Devanagari.ttf: "Lohit Devanagari" "Regular"
DroidSansFallbackFull.ttf: "Droid Sans Fallback" "Regular"
KhmerOS.ttf: "Khmer OS" "Regular"
Waree.ttf: "Waree" "Regular"
Umpush-Bold.ttf: "Umpush" "Bold"
padmaa-Medium-0.5.ttf: "padmaa" "regular"

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https://bugs.launchpad.net/bugs/2025651

Title:
  default Japanese font in snap apps is ugly

Status in Snappy:
  New
Status in language-selector package in Ubuntu:
  New

Bug description:
  Japanese fonts in snap packages such as Firefox use glyphs from
  Chinese fonts. non-snap packages are fine.

  This is derived from the following ticket:
  https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/2017076

  How to reproduce:

  1. Install lunar or mantic with Japanese language pack
  2. Enable Japanese locale
  3. Start Firefox
  4. Type or Copy "刃" to address field and type enter
  5. Check glyph of "刃"

  Expected result:
  The following Japanese glyph is displayed:
  https://glyphwiki.org/wiki/u5203

  Actual result:
  The following Chinese? glyph is displayed:
  https://glyphwiki.org/wiki/zihai-018904

  Others:

  * Ubuntu 22.04 LTS not affected, works fine.
  * Fixed if you remove fonts-droid-fallback package.

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