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…sh (#35824) When flushing the shell, stylesheets with precedence are emitted in the `<head>` which blocks paint regardless. Outlining a boundary solely because it has suspensey CSS provides no benefit during the shell flush and causes a higher-level fallback to be shown unnecessarily (e.g. "Middle Fallback" instead of "Inner Fallback"). This change passes a flushingInShell flag to hasSuspenseyContent so the host config can skip stylesheet-only suspensey content when flushing the shell. Suspensey images (used for ViewTransition animation reveals) still trigger outlining during the shell since their motivation is different. When flushing streamed completions the behavior is unchanged — suspensey CSS still causes outlining so the parent content can display sooner while the stylesheet loads.
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