Custom style cosmetic filter rules for class selectors not applied

[antonok-edm]

Originally posted by @Yuki2718 in #8478 (comment)

Applying google.*##.mn-dwn-arw:style(top: 27px !important;) to Google search results in move of arrow icons as on uBO - for this screenshot I disabled uBO's other filters but keeping them enabled didn't change the results, only changed other appearance such that URL was shown in grey the same as the last screenshot below.

But the same rule on Brave Nightly 1.8.22 didn't and changing the wildcard to "com" google.com##.mn-dwn-arw:style(top: 27px !important;) didn't make a difference.

Any rules without class selectors work fine. For example, brave.com##*:style(background: #f00 !important) changes everything on brave.com to appear with a red background.

[LaurenWags]

Verified passed with

Brave | 1.13.77 Chromium: 85.0.4183.69 (Official Build) dev (64-bit)
-- | --
Revision | 4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS | macOS Version 10.14.6 (Build 18G3020)

• Reproduced the issue using 1.12.112 and test plan from Fix cosmetic resource merging for style selectors brave-core#6176

• Verified test plan from Fix cosmetic resource merging for style selectors brave-core#6176 works as expected on 1.13.77

• Note, if you scroll down the page it resumes normal background. Confirmed with @antonok-edm this is ok.

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Verification passed on

Brave | 1.13.77 Chromium: 85.0.4183.69 (Official Build) dev (64-bit)
-- | --
Revision | 4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS | Windows 10 OS Version 1903 (Build 18362.1016)

• Verified test plan from Fix cosmetic resource merging for style selectors brave-core#6176 works as expected on 1.13.77
  

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Verification passed on

Brave	1.13.79 Chromium: 85.0.4183.69 (Official Build) dev (64-bit)
Revision	4554ea1a1171bd8d06951a4b7d9336afe6c59967-refs/branch-heads/4183@{#1426}
OS	Ubuntu 18.04 LTS

• Verified test plan from Fix cosmetic resource merging for style selectors brave-core#6176

[srirambv]

Removing Android label as this is desktop only. @antonok-edm confirmed it