Fix problem where mass position channels after the first one not being zoomed

When the code was changed to remove x_list, the code used for zooming was not modified to take it into account.

Closes #201 (closed)

requested review from @ldam

assigned to @kienle

changed the description

mentioned in merge request !232 (merged)

approved this merge request

added 11 commits

• fe87f4b4...7fb82536 - 10 commits from branch master
• 9a212db0 - Fix the problem

Compare with previous version

enabled an automatic merge when the pipeline for 9a212db0 succeeds

merged

mentioned in commit b21fe6c8