I've posted patches both in bug 2038478 and bug 2038480. With those patches I can't see no new test failures in testing/web-platform/tests/css/css-scroll-snap/ . Note that though those patches are ready to be reviewed, but as of now it's marked as WIP since there's no automated test. I believe those bugs can be testable. But as of now both are tricky. For bug 2038478 we need native events which scrolls the given delta precisely. For bug 2038480 the test can't run on Linux properly since on Linux native pan gesture events have `mSimulateMomentum` flag, with the flag, the bug will not be triggered.
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I've posted patches both in bug 2038478 and bug 2038480. With those patches I can't see new test failures in testing/web-platform/tests/css/css-scroll-snap/ . Note that though those patches are ready to be reviewed, but as of now it's marked as WIP since there's no automated test. I believe those bugs can be testable. But as of now both are tricky. For bug 2038478 we need native events which scrolls the given delta precisely. For bug 2038480 the test can't run on Linux properly since on Linux native pan gesture events have `mSimulateMomentum` flag, with the flag, the bug will not be triggered.