[snap] 66.0.3359.170 in candidate channel renders fonts incorrectly

[Olivier Tilloy]

Steps to reproduce:

 1) $ snap install chromium
 2) $ snap run chromium
 3) observe that fonts are correctly rendered, both in the chrome and in web content
 4) $ snap refresh chromium --candidate
 5) $ snap run chromium

Expected result: fonts are still rendered correctly.

Current result: fonts are rendered incorrectly (see attached screenshot).

[Olivier Tilloy (osomon)]

Revision 307 (the previous build of 66.0.3359.170 for amd64) is also affected.
Revision 302 (the build immediately before 307 of 66.0.3359.170 for amd64) is *not* affected.

Upon inspecting the differences between the contents of those two snaps, it appears that https://github.com/ubuntu/snapcraft-desktop-helpers/commit/f07d125e3ba4d1175ab8f4615e453a933e2fffa7 is what caused the regression.

[Olivier Tilloy (osomon)]

Copying /snap/chromium/current/etc/fonts/fonts.conf over to ~/snap/chromium/current/.config/fontconfig/ "fixes" the issue, so the contents of fonts.conf generated by the desktop helpers are to blame.

[Olivier Tilloy (osomon)]

Adding the following line to the generated fonts.conf appears to fix the issue:

    <include ignore_missing="yes">conf.d</include>

[Olivier Tilloy (osomon)]

This PR should fix the issue: https://github.com/ubuntu/snapcraft-desktop-helpers/pull/116

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Fixed in 66.0.3359.181 (319) [candidate]