formatters_columns is ignored in fieldsets

[absassi]

Environment

Flask-Appbuilder version: 1.9.6

Describe the expected results

In the show page of a model view, formatters_columns should be used to format all displayed values, regardless of using show_columns or show_fieldsets to select the fields to show.

Describe the actual results

Formatters are not applied when using show_fieldsets.

It's prettry clear from templates/appbuilder/general/widgets/show.html that formatters_columns is only used in the {% else %} of {% if fieldsets %}.