How to Filter Nested Collection? using AdvancedCollectionView

[ghost1372]

Describe the bug

i want to filter/search in a treeview, i am using AdvancedCollectionView however it seems that only first top level items can be searched, i added a nested support in my Filter method but result is not good and i can see wrong items in search results!

this is first top level items which is working fine! as you can see only result shown in ui

and this is nested items which show wrong items!

advancedCollectionView.Filter = item =>
{
    var node = (FileSystemItem)item;
    var name = node.DisplayName ?? "";

    // Check if the current node matches the search text
    if (name.Contains(sender.Text, StringComparison.OrdinalIgnoreCase))
        return true;

    // Check if any child node matches the search text
    foreach (var child in node.Children)
    {
        if (FilterRecursive(child, sender.Text))
            return true;
    }

    // If none of the current node or its children match, return false
    return false;

};

and:

bool FilterRecursive(FileSystemItem node, string searchText)
{
    var name = node.DisplayName ?? "";

    // Check if the current node matches the search text
    if (name.Contains(searchText, StringComparison.OrdinalIgnoreCase))
        return true;

    // Check if any child node matches the search text
    foreach (var child in node.Children)
    {
        if (FilterRecursive(child, searchText))
            return true;
    }

    // If none of the current node or its children match, return false
    return false;
}

Steps to reproduce

add a treeView with nested items and do a search!

Expected behavior

only relevent items should be shown in treeview

Screenshots

No response

Code Platform

• [ ] UWP
• [X] WinAppSDK / WinUI 3
• [ ] Web Assembly (WASM)
• [ ] Android
• [ ] iOS
• [ ] MacOS
• [ ] Linux / GTK

Windows Build Number

• [ ] Windows 10 1809 (Build 17763)
• [ ] Windows 10 1903 (Build 18362)
• [ ] Windows 10 1909 (Build 18363)
• [ ] Windows 10 2004 (Build 19041)
• [ ] Windows 10 20H2 (Build 19042)
• [ ] Windows 10 21H1 (Build 19043)
• [ ] Windows 10 21H2 (Build 19044)
• [ ] Windows 10 22H2 (Build 19045)
• [ ] Windows 11 21H2 (Build 22000)
• [ ] Other (specify)

Other Windows Build number

No response

App minimum and target SDK version

• [ ] Windows 10, version 1809 (Build 17763)
• [ ] Windows 10, version 1903 (Build 18362)
• [ ] Windows 10, version 1909 (Build 18363)
• [ ] Windows 10, version 2004 (Build 19041)
• [ ] Windows 10, version 2104 (Build 20348)
• [ ] Windows 11, version 22H2 (Build 22000)
• [ ] Other (specify)

Other SDK version

No response

Visual Studio Version

2022

Visual Studio Build Number

No response

Device form factor

Desktop

Additional context

No response

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