[wp-trac] [WordPress Trac] #36488: Fix Grunt `precommit` task

[WordPress Trac]

#36488: Fix Grunt `precommit` task
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 Reporter:  netweb            |      Owner:
     Type:  defect (bug)      |     Status:  new
 Priority:  normal            |  Milestone:  Future Release
Component:  Build/Test Tools  |    Version:  4.5
 Severity:  normal            |   Keywords:  has-patch commit
  Focuses:                    |
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 Previously in #35557 via r36906 the task `grunt precommit` was added.

 A minor issue in the original patch mistakenly called `postcss:core` for
 the `precommit` task.

 The `precommit` task CSS sub task should call the `precommit:css`

 FYI: The `postcss:core` task only calls `precommit:css` anyway, so it's
 not broken per se, but it's not inline with the purpose of the original
 patch and should be fixed to operate in the same fashion as the other
 `precommit` sub tasks.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36488>
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