Tests: Wait for reseed convergence after blocked-reload crash recovery

Problem: TestWebDriverSessionHistory regularly failed in CI jobs,
predominantly on (slow/loaded) Sanitizer builds.

Cause: After the crash recovery reloads the current entry, the test
waited only for the WebContent-side reload_blocked_document_ran event,
and then sampled reloadPending once. But reloadPending and the reseed
flags clear on the UI only once WebContent’s load-complete IPC lands —
which lags that event. On a slow or loaded build, the check ran before
the IPC arrived — and failed while the reseed was still in flight.

Fix: Wait for the reseed to converge (reloadPending and the seed and
reseed flags all cleared) instead of sampling once — matching the wait-
for-convergence pattern used elsewhere in the test.

Author: sideshowbarker

Tests/LibWebView/test-webdriver-session-history.py

@@ -5279,8 +5279,17 @@ def browser_ui_traverse_setup_is_mirrored(snapshot):
         page_server.release_blocked_reload.set()
         wait_for_event(page_server.reload_blocked_document_ran, "reload document after crash recovery")
         expect_url(webdriver_port, session_id, "after blocked reload crash recovery", url_reload_blocked, log)
-        expect_current_ui_entry_reload_pending(
-            webdriver_port, session_id, "after blocked reload crash recovery", False, log
+        wait_for_session_history(
+            webdriver_port,
+            session_id,
+            "reload pending clears after blocked reload crash recovery",
+            lambda snapshot: (
+                not history_current_entry(snapshot["ui"])["reloadPending"]
+                and not snapshot["ui"]["waitingToSeedWebContent"]
+                and not snapshot["ui"]["waitingForWebContentSeedAck"]
+                and not snapshot["ui"]["reseedAfterCurrentHistoryLoad"]
+            ),
+            log,
         )
 
         expect_cross_site_fragment_navigation_from_ui_loads_document(