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PropertyGrid incorrect editor for IList of T, T is primitive type?

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
csharp
Domain
desktop

Research direction

Start by tracing PropertyGrid's default editor selection for the two properties shown: IList and List. Compare why List returns PrimitiveTypeCollectionEditor while IList returns CollectionEditor, then add a regression test showing that both primitive-item collection types select PrimitiveTypeCollectionEditor.

Written by the indexing model from the issue text.

Description

If I have these properties with item type is primitive type

public IList<int> IListOfInt { get; set; }
public List<int> ListOfInt { get; set; }

PropertyGrid is correctly return 'PrimitiveTypeCollectionEditor' as default editor for List<int>. However, for IList<int>, it returns 'CollectionEditor' as the default editor.

I will thought IList<int> should also use 'PrimitiveTypeCollectionEditor', why not?

Dominant language
C#
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