[wp-trac] [WordPress Trac] #53605: Twenty Twenty-One: Investigate duplicate rules in `ie-editor.css`

[WordPress Trac]

#53605: Twenty Twenty-One: Investigate duplicate rules in `ie-editor.css`
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 Reporter:  SergeyBiryukov                       |       Owner:  (none)
     Type:  defect (bug)                         |      Status:  assigned
 Priority:  normal                               |   Milestone:  5.9
Component:  Bundled Theme                        |     Version:  trunk
 Severity:  normal                               |  Resolution:
 Keywords:  needs-testing has-patch good-first-  |     Focuses:
  bug                                            |
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Changes (by mukesh27):

 * owner:  Shital Patel => (none)
 * status:  accepted => assigned


Comment:

 We already fix a similar issue before so I think we have to go ahead with
 the solution suggested below.

 Replying to [comment:2 ryelle]:
 > They suggest using a minification plugin or
 [https://github.com/cssnano/cssnano/tree/master/packages/postcss-merge-
 rules#by-declarations postcss-merge-rules] to merge these back together. …
 Since I'm here, I gave the merge-rules plugin a try and it works
 surprisingly well. I don't have my IE machine up at the moment, so I can't
 test the output, but it looks correct.
 >
 > Just noting, this isn't the first issue we've had with `postcss-css-
 variables` - see #52158 where the `postcss-discard-duplicates` plugin was
 added to clean up another bug.


 @shital-patel @Shaharyar10 Thanks for the patch. IE related CSS is
 generated automatically in the build process.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53605#comment:8>
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