Investigate E2E test in multi-block-selection.test.js

[gwwar]

When running this E2E locally: npm run test-e2e -- --puppeteer-interactive specs/editor/various/multi-block-selection.test.js

Multi-block selection › should clear selection when clicking next to blocks fails, but somehow works in CI. Let's investigate to see why this is happening.

This is a follow up to #29836

[gwwar]

It looks like this one does fail sometimes for example see https://github.com/WordPress/gutenberg/runs/2297750606

Do folks have any time to 🔍 a bit more closely? cc @ellatrix @gziolo

[gziolo]

It might be a difference in implementation between the Chrome browser and Chromium that is used in the headless mode. Another factor is the speed of execution, in the interactive mode everything is simulated slower. You can use --puppeteer-slowmo=1 to speed things up.