I'm learning the Bach's French suite using this edition. Throughout there is a small separator (small vertical line) and I cannot guess its meaning. It definitely have something to do with this question, but it doesn't explain whole of them, and if it is just a change in a repetitive pattern, not all of them are noted. Here is an example (see the vertical line between the first and the second eighth-note.). Here it is indeed a change in a repetitive pattern.
If it is indeed the meaning, what exactly qualify for a change in a repetitive pattern? Do you use these marking when studying/playing the piece?