[Bug 1834406] Re: Upgrade Noto Sans CJK fonts to version 2.001

[Gunnar Hjalmarsson]

Thanks Łukasz! Sure, we'll call for testing when the packages are in
-proposed.

At the moment they are in the upload queues. I uploaded fonts-noto-cjk
to cosmic too 'for version technical reasons'. Not sure if that was
necessary...

** Also affects: language-selector (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: language-selector (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: fonts-noto-cjk (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** No longer affects: language-selector (Ubuntu Cosmic)

** Changed in: fonts-noto-cjk (Ubuntu Bionic)
   Importance: Undecided => Medium

** Changed in: fonts-noto-cjk (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: fonts-noto-cjk (Ubuntu Bionic)
     Assignee: (unassigned) => Gunnar Hjalmarsson (gunnarhj)

** Changed in: fonts-noto-cjk (Ubuntu Cosmic)
       Status: New => In Progress

** Changed in: fonts-noto-cjk (Ubuntu Disco)
   Importance: Undecided => Medium

** Changed in: fonts-noto-cjk (Ubuntu Disco)
       Status: New => In Progress

** Changed in: fonts-noto-cjk (Ubuntu Disco)
     Assignee: (unassigned) => Gunnar Hjalmarsson (gunnarhj)

** Changed in: language-selector (Ubuntu)
       Status: New => Fix Released

** Changed in: language-selector (Ubuntu Bionic)
   Importance: Undecided => Medium

** Changed in: language-selector (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: language-selector (Ubuntu Bionic)
     Assignee: (unassigned) => Gunnar Hjalmarsson (gunnarhj)

** Changed in: language-selector (Ubuntu Disco)
   Importance: Undecided => Medium

** Changed in: language-selector (Ubuntu Disco)
       Status: New => In Progress

** Changed in: language-selector (Ubuntu Disco)
     Assignee: (unassigned) => Gunnar Hjalmarsson (gunnarhj)

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https://bugs.launchpad.net/bugs/1834406

Title:
  Upgrade Noto Sans CJK fonts to version 2.001

Status in fonts-noto-cjk package in Ubuntu:
  Fix Released
Status in language-selector package in Ubuntu:
  Fix Released
Status in fonts-noto-cjk source package in Bionic:
  In Progress
Status in language-selector source package in Bionic:
  In Progress
Status in fonts-noto-cjk source package in Cosmic:
  In Progress
Status in fonts-noto-cjk source package in Disco:
  In Progress
Status in language-selector source package in Disco:
  In Progress
Status in fonts-noto-cjk package in Debian:
  New

Bug description:
  [Impact]

  Due to Japan's new era, a Unicode character has been introduced which
  represents the era name (Reiwa) as one single character. The version
  of fonts-noto-cjk in the stable releases does not support the new
  character, which is what motivates a backport of the eoan fonts-noto-
  cjk version. The proposed SRU is in line with the meta bug #1828884.

  This means an upgrade of Noto Sans CJK from version 1.004 to 2.001,
  and it will bring a few other changes in the bargain. Most notably a
  new set of Hong Kong fonts has been added to the previous ones
  (simplified and traditional Chinese, Japanese, and Korean). Attached
  to this bug report please see the file noto-sans-cjk-news.txt with
  upstream's detailing of the changes.

  [Test Case]

  Install from {bionic,cosmic,disco}-proposed:

  - fonts-noto-cjk
  - fonts-noto-cjk-extra
  - language-selector-common
  - language-selector-gnome

  1. The Reiwa glyph
  --------------------------
  Visit http://people.ubuntu.com/~gunnarhj/square-era-name-reiwa.html
  and find that a proper Japanese character, and not a tofu, is shown.

  2. Presence and configuration of HK fonts
  -----------------------------------------
  (This also bears on the language-selector changes.)

  * Install the Hong Kong locale:

    sudo locale-gen zh_HK.UTF-8

  * Run this command:

    LC_CTYPE=zh_HK.UTF-8 fc-match

    and find that it returns:

    NotoSansCJK-Regular.ttc: "Noto Sans CJK HK" "Regular"

  3. General use
  --------------
  Browse some web sites with Chinese, Japanese or Korean contents and
  confirm that the upgrade does not cause any font rendering issues.

  [Regression Potential]

  This somewhat aggressive SRU proposal is based on trust in Google and
  Adobe as solid upstream providers of these fonts. Version 2.000 (which
  includes most of the changes) was released in November 2018, while
  version 2.001 (with the Reiwa glyph) was released in April 2019.
  Serious problems should have been known by now. The upstream bug
  tracker gives no cause for concern:

  https://github.com/googlefonts/noto-cjk/issues

  It may be worth mentioning that the fonts are provided as OTC files,
  and we don't compile those files ourselves. Hence just patching the
  new glyph would not be a practicable option.

  It would be easy to reverse this upgrade, if regressions would be
  reported. Basically we are talking about 7 files on the file system.

  [Other Info re. eoan]

  Since Debian hasn't packaged this yet, we have created a modified
  .orig.tar.xz file where 7 .ttc files (plus NEWS and HISTORY) differ
  from version 1:20181130+repack1-1~exp1, i.e. the latest Debian upload.

  There is no other Ubuntu/Debian delta, so as soon as Debian has
  catched up, it will be fine to start syncing again.

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