Incorrect checkbox help text alignment in multi-field rows

[Adam Johnson]

For a single checkbox, styles align the help under the checkbox:

When the checkbox appears with any other field in the same line, this is undone:

Example admin:

from django.contrib import admin
from example.models import Switcher


class SwitcherAdmin(admin.ModelAdmin):
    fieldsets = [
        (
            None,
            {
                "fields": [
                    ("up", "down"),
                ],
            },
        ),
    ]


admin.site.register(Switcher, SwitcherAdmin)

(It doesn’t matter if the other field is a checkbox or not.)

Changing fieldset.html so checkbox-row is applied unconditionally to checkbox-containing field boxes fixes this regression, plus #34994:

[Adam Johnson]

single-correct

[Adam Johnson]

double-incorrect

[Adam Johnson]

fixed

[Adam Johnson]

previous-dense