[iOS] Fixes drag during webStateList update `_visibleItemsDuringDrag` should be recreated after a webStateList update. Otherwise the `destinationItemIndex` could be greater than its count. This CL also adds a safety check before allowing to drop an item to an invalid index. Bug: 394365060 Change-Id: I442611d3d78bb62afe119c03ad739580af9610fb Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6243857 Commit-Queue: Ewann Pellé <ewannpv@chromium.org> Reviewed-by: Louis Romero <lpromero@google.com> Cr-Commit-Position: refs/heads/main@{#1417268}
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