[Enhancement] Sorting of "Select by group" dropdown when group labels are numbers

[Tixierae]

In the "Les miserables" example, when expanding the "Select by group" dropdown, the levels are not sorted in increasing or decreasing order (e.g., 10 is between 1 and 2). Would it be possible to detect (or let the user specify) when group labels are numbers and provide adequate sorting?

[bthieurmel]

Fix. Now, numeric/integer are sorted as number, and character/factor are sorted as character.
Thanks

[Tixierae]

Thanks!