feat(TreeView): redesign reset search logic

[ArgoZhang]

Link issues

fixes #8297

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Refine TreeView search and reset behavior to support null search terms and maintain active item selection after searches are cleared.

New Features:

• Add hierarchical search helper for TreeView samples that filters and clones tree nodes while preserving parent-child structure.

Bug Fixes:

• Ensure TreeView reset search action re-invokes the search callback with a null term to clear results consistently.
• Prevent search callbacks from returning non-null results on empty search terms in TreeView and SelectTree tests.

Enhancements:

• Make sample TreeView search item collections non-nullable and improve active item restoration logic when applying search results.
• Adjust TreeView search callback documentation to describe behavior on search reset.

Tests:

• Update TreeView and SelectTree unit tests to validate search callbacks are invoked with null on reset and that search counts and results are correct.

[sourcery-ai]

Reviewer's Guide

Redesigns TreeView search/reset behavior to use structured, hierarchical search results and to consistently re-invoke the search callback with null on reset, while simplifying active-item handling and updating tests accordingly.

Sequence diagram for the updated TreeView search and reset logic

sequenceDiagram
    actor User
    participant TreeView
    participant OnSearchAsync

    User->>TreeView: OnClickSearch()
    alt OnSearchAsync is not null
        TreeView->>OnSearchAsync: OnSearchAsync(_searchText)
        OnSearchAsync-->>TreeView: searchItems
        TreeView->>TreeView: _searchItems = searchItems
    else OnSearchAsync is null
        TreeView->>TreeView: _searchItems = null
    end
    TreeView->>TreeView: _rows = null
    alt _activeItem is not null
        TreeView->>TreeView: Rows.FirstOrDefault(match _activeItem.Value)
        alt item found
            TreeView->>TreeView: SetActiveItem(item)
        else item not found
            TreeView->>TreeView: StateHasChanged()
        end
    else _activeItem is null
        TreeView->>TreeView: StateHasChanged()
    end

    User->>TreeView: OnClickResetSearch()
    TreeView->>TreeView: _searchText = null
    TreeView->>TreeView: OnClickSearch()
    note over TreeView,OnSearchAsync: OnSearchAsync is invoked again with null searchText

Loading

File-Level Changes

Change	Details	Files
Refactor sample TreeView search to perform hierarchical filtering and avoid mutating the original data source.	Make sample TreeView MaxItems and SearchItems collections non-nullable and initialized from TreeFoo.GetTreeItems() Change sample OnSearchAsync signature to accept nullable searchText, and delegate filtering to a helper method when search text is provided Introduce GetSearchItems helper that recursively filters tree items by search text, preserving hierarchy and cloning nodes to avoid polluting the source Introduce CloneItem helper to copy TreeViewItem properties while forcing nodes to be expanded in search results	src/BootstrapBlazor.Server/Components/Samples/TreeViews.razor.cs
Adjust TreeView component search/reset behavior to always re-run the search callback and simplify active item restoration.	Update OnSearchAsync XML documentation to clarify that it is invoked again with null when search is reset Refactor OnClickSearch to always recompute _searchItems and reset _rows, and to re-select the active item from the new Rows when possible Simplify OnClickResetSearch to clear _searchText and delegate to OnClickSearch so reset goes through the same path and re-invokes OnSearchAsync with null	src/BootstrapBlazor/Components/TreeView/TreeView.razor.cs
Align TreeView and SelectTree tests with new search/reset semantics including null results on empty search and re-invocation counts.	Update Enter_Ok and SelectTree OnSearchAsync_Ok tests so their OnSearchAsync callbacks return null when the search term is null or empty, instead of always returning a result Extend Search_NullBranches_Ok test to capture searchCount and searchText in the test callback and assert that search is invoked three times and that the last invocation uses a null search term	test/UnitTest/Components/TreeViewTest.cs test/UnitTest/Components/SelectTreeTest.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8297	Redesign TreeView search reset behavior so that clearing the search reuses the search logic and invokes the search callback with a null search term, updating component state accordingly and documenting this behavior.	✅
#8297	Update TreeView/SelectTree search-related implementations and tests to align with the new reset-search behavior, including handling null/empty search terms and verifying the reset flow.	✅

Possibly linked issues

• feat(TreeView): redesign reset search logic #8297: PR implements the TreeView reset search logic redesign requested in the issue, including callback behavior and tests.

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[bb-auto]

Auto approved by bb-auto

[sourcery-ai]

Hey - I've left some high level feedback:

• In GetSearchItems, consider defensively handling a null item.Items (e.g., iterating over item.Items ?? Enumerable.Empty<TreeViewItem<TreeFoo>>()) to avoid potential NullReferenceExceptions when a node has no children collection initialized.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `GetSearchItems`, consider defensively handling a null `item.Items` (e.g., iterating over `item.Items ?? Enumerable.Empty<TreeViewItem<TreeFoo>>()`) to avoid potential `NullReferenceException`s when a node has no children collection initialized.

---

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[bb-auto]

Auto approved by bb-auto

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d6602d2) to head (2678089).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #8298   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          769       769           
  Lines        34491     34477   -14     
=========================================
- Hits         34491     34477   -14     

Flag	Coverage Δ
BB	100.00% <100.00%> (?)

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