Django Admin filter sidebar wraps if its inner content becomes too large

[Mark]

In the course of ticket #36511 the layout of the changelist and its filter sidebar has been changed so that the sidebar seemingly should have a fixed width of 240px.

The flex-base property does not necessarily restrict the width of the sidebar if it's content demands more (which happens eg. for dropdowns with large titles). Combined with the flex: wrap attribute, the sidebar wraps if the table also demands more width than available and looks broken (see attachment).

This behavior can be simulated by giving a sidebar's and changelist's children some fixed, large width:

#changelist-filter-extra-actions {
  width: 290px;
}
#toolbar {
  width: 1000px;
}

The problem could be resolved by reverting to the previous flex layout, but the motivation for those changes is unclear to me from the ticket and ​related pr.

Should the width of the sidebar stick to 240px or - at it has been before - should the sidebar grow if necessary?

Does the new flex layout have any advantages to how it was in django <6?