gui tests: routing-sessions leaves the held live trace for a reload to cancel; letting it go just before the reload had the page ask again while going away, which WebKit turned away "due to access control checks" as a page error (#1307)

internal/gui/tests/routing-sessions.test.cjs

@@ -299,12 +299,14 @@ for (const engine of (process.env.BROWSER ? [process.env.BROWSER] : ["chromium",
       assert.equal(await page.locator(".rt-session").count(), 0);
       await buttons.nth(1).click();
       await page.locator(".rt-session").nth(3).waitFor();
-      feed.next?.([]);
+      // the live trace's held answer is left held: the reload cancels it. An
+      // answer let go now has the page ask again while it is going away, and
+      // WebKit turns that ask away "due to access control checks", an error
+      // on the page (#1307)
       await page.reload();
       await page.locator(".rt-session").nth(3).waitFor();
       assert.equal(await buttons.nth(1).getAttribute("aria-pressed"), "true");
       await buttons.first().click();
-      feed.next?.([]);
       await page.reload();
       await page.locator(".rt-req").nth(5).waitFor();
       assert.equal(await buttons.first().getAttribute("aria-pressed"), "true");
@@ -396,7 +398,8 @@ for (const engine of (process.env.BROWSER ? [process.env.BROWSER] : ["chromium",
       await page.locator(".rt-day").filter({ hasText: lang === "zh" ? "今天" : "today" }).click();
       await page.waitForFunction(() => document.querySelectorAll(".rt-session").length === 2);
       assert.equal(await group(title.session).count(), 0, "history navigation lost title association");
-      feed.next?.([]);
+      // the held live trace is left for the reload to cancel (see "either
+      // choice survives a reload")
       await page.reload();
       await page.waitForFunction(() => document.querySelectorAll(".rt-session").length === 2);
       assert.equal(await group(title.session).count(), 0, "page reload lost title association");