[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}
NOKEYCHECK=True
GitOrigin-RevId: c1460e4c0ff90e4a2ffa46ff200141c66fa8b5cc
1 file changed
tree: af169ac7e9eec69bad7370b117f24b4d99623977
  1. build/
  2. chrome/
  3. components/
  4. google_internal/
  5. intents/
  6. net/
  7. public/
  8. testing/
  9. third_party/
  10. tools/
  11. web/
  12. web_view/
  13. .swift-format
  14. BUILD.gn
  15. COMMON_METADATA
  16. DEPS
  17. DIR_METADATA
  18. features.gni
  19. OWNERS
  20. PRESUBMIT.py
  21. PRESUBMIT_test.py
  22. README.md
README.md

This directory holds code related to Chrome for iOS. See this document for a description of the structure underneath this directory.