[chubes4]

Fixes #5216.

What

AuthorStylesheetProjector emits a bridge rule for every source rule that targets an image: ….wp-block-image > img{…;border-radius:inherit}. The bridge is right when the image's class moved onto the generated figure, because then the source rule paints the figure and the image follows it. It is wrong when the rule's subject is a bare img (.avatar img, .card > img). In that case nothing moves to the figure, the source rule still paints the image itself, and the bridge overrides the image's own radius with the figure's 0 at the same specificity, later in the cascade. The result is round avatars imported as squares.

The bridge now omits border-radius:inherit for selectors whose subject compound is a bare img. In a mixed list (.photo, .avatar img), only the moved arms keep the inherit, in a separate rule at the same cascade position.

Evidence

I compiled each case with ArtifactCompiler and measured the computed radius of the rendered img in Chromium:

case	source	trunk	this branch
.photo{border-radius:50%} on <img class="photo"> (class moves to the figure)	50%	50%	50%
img.round{…}	50%	50%	50%
.avatar img{border-radius:50%}	50%	0px	50%
the same, plus a later radius-less @media rule for .avatar img	50%	0px	50%
.avatar img{border-top-left-radius:50%}	50% / 0	0px / 0	50% / 0
.photo, .avatar img{…}, both images	50%, 50%	50%, 0px	50%, 50%
.card{border-radius:20px;overflow:hidden} around a bare image	clipped 20px	clipped 20px	clipped 20px

An earlier attempt removed the bridge's border-radius:inherit outright. That fixed the third row and broke the first, which is why the first row stays in the test.

Test

There is a new table-driven case in tests/unit/artifact-author-stylesheet-projection.php. It resolves each image's border-radius with StaticCssCascade, following inherit to the figure, and covers the moved class, the descendant subject, the later breakpoint rule and the mixed list. On trunk it fails for the descendant subject, the later breakpoint rule and the mixed list; the moved-class row guards against the earlier regression. StaticCssCascade does not expand radius shorthands, so the longhand row is covered by the browser check above only.

The full composer test suite passes (1314 tests).

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This PR was finished outside Homeboy: Cook could not admit the task, failing in Lab admission before the provider ran. The fix, test and verification were written by Franklin (Claude, an Anthropic model, via the Pi coding agent and Roadie). A human (@chubes4) directed the work.