[wasm][debugger] RootHidden is not working correctly in DebuggerTypeProxy

[thaystg]

var list = new List<string>();
var a = "test";
list.Add(a);

On wasm:

In a console app:

Items is DebuggerRootHidden, so I think it should not show.

runtime/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ICollectionDebugView.cs

Line 19 in 215b39a

[DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]

When fixed, remove else block from:

runtime/src/mono/wasm/debugger/BrowserDebugProxy/MemberObjectsExplorer.cs

Lines 149 to 161 in 8064bfe

	else
	{
	// a collection - expose elements to be of array scheme
	var memberNamedItems = members
	.Where(m => m["name"]?.Value<string>() == "Items" || m["name"]?.Value<string>() == "_items")
	.FirstOrDefault();
	if (memberNamedItems is not null &&
	(DotnetObjectId.TryParse(memberNamedItems["value"]?["objectId"]?.Value<string>(), out DotnetObjectId itemsObjectId)) &&
	itemsObjectId.Scheme == "array")
	{
	rootObjectId = itemsObjectId;
	}
	}

Tagging subscribers to this area: @thaystg
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Issue Details

---

        var list = new List<string>();
        var a = "test";
        list.Add(a);

On wasm:

In a console app:

Items is DebuggerRottHidden, so I think it should not show.

runtime/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ICollectionDebugView.cs

Line 19 in 215b39a

[DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]

Author:	thaystg
Assignees:	ilonatommy
Labels:	area-Debugger-mono
Milestone:	8.0.0

Tagging subscribers to 'arch-wasm': @lewing
See info in area-owners.md if you want to be subscribed.

Issue Details

---

var list = new List<string>();
var a = "test";
list.Add(a);

On wasm:

In a console app:

Items is DebuggerRootHidden, so I think it should not show.

runtime/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ICollectionDebugView.cs

Line 19 in 215b39a

[DebuggerBrowsable(DebuggerBrowsableState.RootHidden)]

Author:	thaystg
Assignees:	ilonatommy
Labels:	arch-wasm, area-Debugger-mono
Milestone:	8.0.0

[ilonatommy]

We don't have access to external code's DebuggerHidden, probably because of trimming.
In the case with a list you suggested:

{
  "type": "object",
  "value": null,
  "description": "Count = 1",
  "className": "System.Collections.Generic.List<string>",
  "objectId": "dotnet:object:2"
}

after calling getProperties we are getting an info about the list's type correctly: System.Collections.Generic.ICollectionDebugView<string>. We have access to its properties, we can see it has a member Items. For Items we are getting only one element in CustomAttributeHandleCollection and it's of MethodDefinition kind. It belongs to the default constructor .ctor.

For sure for aggressive trimming switched on, we have some problems with Debugger Attrs - #57588.