Backport of "basesink: Don't swap rstart/rstop when stepping" into 1.18
Backport of !848 (merged) "basesink: Don't swap rstart/rstop when stepping".
Commits:
- b1b5b2d4 basesink: Don't swap rstart/rstop when stepping
Backport of !848 (merged) "basesink: Don't swap rstart/rstop when stepping".
Commits: