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We use the generic `page.mouse.move(x, y, { steps }` API, but that purely
performs the mouse move steps without having knowledge about if/how the
application handles any events caused by it, so it doesn't wait for the
sidebar to render before moving on. This causes intermittent failures if
the sidebar didn't get enough time to render before the next mouse move
is initiated (which can happen in slower environments).
This commit fixes the issue by doing the mouse move steps ourselves and
by waiting for a browser trip between each of them to make sure that the
sidebar got a chance to render.
Fixes #21447.
Relates to #21044 / #21045 / 24e5377.