[Bug 1771559] Re: error while loading icon with pyscss 1.3.5 or later

[OpenStack Infra]

Reviewed:  https://review.opendev.org/722533
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=d4028b97db87f54ba2c43268b5adccfa497ed594
Submitter: Zuul
Branch:    stable/stein

commit d4028b97db87f54ba2c43268b5adccfa497ed594
Author: Ivan Kolodyazhny <e0ne at e0ne.info>
Date:   Tue Apr 14 12:19:29 2020 +0300

    Implement 'selector-append' sass function
    
    'selector-append' is used in xstatic-mdi [1] but it isn't supported by
    the latest pyScss.
    As a workaround we use 'append-selector' function from pyScss until
    'selector-append' will be supported.
    
    This patch also reverts Ia9e1e807591d4428f585177f521d4cb9d463b917
    because we don't need it anymore.
    
    [1] https://opendev.org/openstack/xstatic-mdi/src/tag/1.6.50.2/xstatic/pkg/mdi/data/scss/_functions.scss#L2
    
    stable/train backport:
    A release note on the known issue is now removed as it is fixed
    by this commit. Instead, a note on the workaround by this commit
    is added.
    
    Change-Id: Ib8ca0fcfe339cb68d6a157a00cbc2d34854ef4c5
    Closes-Bug: #1771559
    (cherry picked from commit 74d76e900f28e88190a35bff921c56349077ca53)
    (cherry picked from commit f26c88721614d1c25bcd26740b8fb20a7a97bd05)


** Tags added: in-stable-stein

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https://bugs.launchpad.net/bugs/1771559

Title:
  error while loading icon with pyscss 1.3.5 or later

Status in OpenStack Dashboard (Horizon):
  Fix Released
Status in python-pyscss package in Ubuntu:
  Confirmed

Bug description:
  Hello,

  Impossible to fetch font awesome icons with material design theme (provided in the package)
  No error in the web development console, but browser show symbol number like "xf44f" instead of showing icons.

  STEPS TO REPRODUCE:
  Use Chrome web browser
  Login to horizon
  Change theme to "Material"
  Try to use Horizon as usual

  Regards.

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