Collapse namespaces in tag lists

[thatfuckingbird]

There should be a way (preferably some shortcut), to (un)collapse namespaces in tag lists.
For example a tag list with

creator:a
creator:b
creator:c
creator:d
title:a
title:b

should display something like

creator:... (4 collapsed)
title:... (2 collapsed)

after toggling this. This should only affect the tag list it was actived on.

[ShadowJonathan]

This would help especially when having the list viewer "unselected" at that moment, where the tag list displays all tags on all files, if these can be collapsed, then scrolling through them while skipping big namespaces could be a breeze

[bbappserver]

Something to the effect of

With one column, or the second column being count.
https://doc.qt.io/qt-5/qtreeview.html#details