Allow multiline css declarations in less files for increased readability

[hostep]

Preconditions

1. Have a file test1.less like this:

& when (@media-common = true) {
    .lib-icon-font(
        @icon-camera__content,
        @_icon-font: @icons-admin__font-name,
        @_icon-font-size: @image-gallery-placeholder-icon__size,
        @_icon-font-color: @image-gallery-placeholder-icon__color,
        @_icon-font-text-hide: true
    );
}

2. Have a file test2.less like this:

& when (@media-common = true) {
    .lib-icon-font(@icon-camera__content, @_icon-font: @icons-admin__font-name, @_icon-font-size: @image-gallery-placeholder-icon__size, @_icon-font-color: @image-gallery-placeholder-icon__color, @_icon-font-text-hide: true);
}

3. See that the contents of these 2 files are the same, it's just the formatting of the code that's different

Steps to reproduce

1. Run vendor/bin/phpcs -s --standard=Magento2 test*.less

Expected result

1. Both files should show no errors

Actual result

1. Getting this output:

FILE: test1.less
-------------------------------------------------------------------------------------------------------------------------
FOUND 0 ERRORS AND 4 WARNINGS AFFECTING 4 LINES
-------------------------------------------------------------------------------------------------------------------------
 4 | WARNING | Expected 1 space after colon in style definition; newline found
   |         | (Magento2.Less.ColonSpacing.AfterNewline)
 5 | WARNING | Expected 1 space after colon in style definition; newline found
   |         | (Magento2.Less.ColonSpacing.AfterNewline)
 6 | WARNING | Expected 1 space after colon in style definition; newline found
   |         | (Magento2.Less.ColonSpacing.AfterNewline)
 7 | WARNING | Expected 1 space after colon in style definition; newline found
   |         | (Magento2.Less.ColonSpacing.AfterNewline)
-------------------------------------------------------------------------------------------------------------------------

Time: 78ms; Memory: 6MB

Discussion

In my opinion, the formatting of the code in file test1.less is a lot more readable then in file test2.less. Coding standards shouldn't recommend to make code less readable.
Also, Magento uses this syntax as well in its own code and is thus violating its own coding standards ...

This was already reported before, but just in a comment on another issue, now it has its own proper issue which might make it faster to get picked up?

[m2-assistant]

Hi @hostep. Thank you for your report.
To speed up processing of this issue, make sure that you provided sufficient information.
Add a comment to assign the issue: @magento I am working on this

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