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fix(studio): short-circuit slideshow-island detection with a substring check (review N2)

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slideshowIslandRegex scanned the full file content on every editingFile
change even for the common non-slideshow case. Gate it behind a plain
substring check on SLIDESHOW_ISLAND_TYPE first — cheap, and avoids the
full-content RegExp pass for files that plainly have no island.

Added a test for the still-open behavior this preserves: a malformed
island (invalid JSON) still trips the substring check and the regex,
so the tab stays discoverable rather than silently disappearing.
This commit is contained in:
Vance Ingalls
2026-07-17 00:37:39 -07:00
parent a4167ede07
commit 53b3621437
2 changed files with 15 additions and 6 deletions
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packages/studio/src/hooks/useSlideshowTabState.test.ts
+7
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@@ -69,6 +69,13 @@ describe("useSlideshowTabState", () => {
harness.unmount();
});
it("still detects a malformed island — presence-only, not full manifest validation", () => {
const malformed = `<html><body><script type="application/hyperframes-slideshow+json">{not valid json</script></body></html>`;
const harness = renderHook({ editingFileContent: malformed, rightPanelTab: "design" });
expect(harness.getState().isSlideshowComposition).toBe(true);
harness.unmount();
});
it("bounces rightPanelTab off 'slideshow' to 'renders' on a non-slideshow composition", () => {
const harness = renderHook({ editingFileContent: PLAIN_HTML, rightPanelTab: "slideshow" });
expect(harness.setRightPanelTabCalls).toEqual(["renders"]);