I updated the function getGroupString on my store in order to ignore the "A" or "An" at the beginning of the field while grouping. For example, when the field is "an orange", I want it to go to the "o" group.
Strange thing is : my list is not sorted by groupString. For example, with the field "an orange", the group is actually "O" as expected, but the group itself is sorted before "B" because the started "A" is used...
Any idea ?
Thank you all !