VW 2020 list browser double click regression?

[Hans Martin Kern 2]

A dialog of ours displays a list browser with a list of choices. Users can double-click on one of the items in order to select AND close the dialog right away. This is implemented in the dialog event handler function by
 

if (itemHit == -kListBrowser)
    itemHit = kDefaultButtonID;

This was working fine on both platforms for years, but with VW 2020, the code is no longer working on Windows (macOS still works fine). 

Is this a regression or do we need jump through more hoops due to the new editable list browsers?