Steps to reproduce

1. Press the "Step one row" button, or enter the "Step row" keyboard shortcut.
2. Press either the "Play from the beginning of this pattern" or "Repeat from the beginning of this pattern" button. (Note that the bug does not occur when using the "Play (from beginning)" keyboard shortcut.)

Expected behaviour

The song starts playing from the beginning of the current pattern.

Actual behaviour

The song starts playing from the last row that was stepped to.