fix(TreeView): CheckboxItems support filter function

[ArgoZhang]

Link issues

fixes #8289

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

Ensure TreeView checkbox state changes remain consistent when using search results, including cascaded parent/child checking.

Bug Fixes:

• Fix desynchronization between checked states of TreeView items and their corresponding search result items when toggling checkboxes.
• Ensure cascaded parent/child checkbox behavior works correctly when interacting via search-filtered TreeView items.

Tests:

• Add unit tests covering checkbox interactions on search-filtered TreeView items, including cascade scenarios with parent and child nodes.

[sourcery-ai]

Reviewer's Guide

TreeView checkbox behavior is updated so that checking items in search results correctly syncs with the underlying tree items, including cascaded parent/child checking, and new unit tests verify the behavior.

Sequence diagram for TreeView search checkbox sync

sequenceDiagram
    actor User
    participant SearchTreeViewItem as SearchTreeViewItem
    participant TreeView as TreeView
    participant TreeNodeStateCache as _treeNodeStateCache
    participant SourceTreeViewItem as SourceTreeViewItem

    User ->> SearchTreeViewItem: OnCheckStateChanged(item, state)
    SearchTreeViewItem ->> TreeView: OnCheckStateChanged(item, state)
    TreeView ->> TreeView: SyncSearchItemCheckedState(item)
    TreeView ->> TreeNodeStateCache: Find(Items, item.Value, out state)
    TreeNodeStateCache -->> TreeView: sourceItem
    alt [sourceItem found and not same reference]
        TreeView ->> SourceTreeViewItem: set CheckedState
        TreeView ->> TreeNodeStateCache: ToggleCheck(sourceItem)
        alt [AutoCheckChildren && sourceItem.CheckedState != CheckboxState.Indeterminate]
            TreeView ->> SourceTreeViewItem: SetChildrenCheck(_treeNodeStateCache)
        end
        alt [AutoCheckParent]
            TreeView ->> SourceTreeViewItem: SetParentCheck(_treeNodeStateCache)
        end
    end
    TreeView ->> TreeView: GetCheckedItems()
    TreeView -->> User: OnTreeItemChecked([...])

Loading

File-Level Changes

Change	Details	Files
Ensure checkbox state changes made on search result items are synchronized back to the corresponding items in the full tree, including cascaded parent/child updates.	Call a new synchronization helper from the checkbox state change handler to propagate state changes from the displayed item to the source tree item. Map the checked search item back to its source item using the tree node cache and update the source item’s CheckedState. Trigger child auto-check behavior when enabled and the item is not indeterminate. Trigger parent auto-check behavior when enabled so parent nodes reflect child state.	src/BootstrapBlazor/Components/TreeView/TreeView.razor.cs
Add unit tests that validate checkbox behavior when using search, including non-cascade and cascade scenarios, and ensure previously checked items and cascade options behave correctly.	Add a test that verifies checking/unchecking a search result item updates the underlying tree item’s CheckedState and OnTreeItemChecked results, including when the search result does not directly match existing items. Add a test that verifies cascade checking (AutoCheckChildren/AutoCheckParent) works when interacting with search results, covering indeterminate and fully-checked states. Use BootstrapInput and Checkbox component interactions to simulate user search and checkbox toggling within the TreeView.	test/UnitTest/Components/TreeViewTest.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8289	Ensure TreeView checkbox items correctly support and synchronize state when using the search/filter function (i.e., checking/unchecking items in filtered results updates the underlying tree items and cascades to parents/children according to AutoCheck settings).	✅

Possibly linked issues

• bug(TreeView): CheckboxItems support filter function #8289: PR implements checkbox state sync for TreeView search items, directly fixing the reported CheckboxItems filter support bug.

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[bb-auto]

Auto approved by bb-auto

[sourcery-ai]

Hey - I've left some high level feedback:

• In SyncSearchItemCheckedState, consider reusing existing cascade logic instead of duplicating the AutoCheckChildren/AutoCheckParent handling to keep all checkbox propagation paths consistent and easier to maintain.
• The lookup in _treeNodeStateCache.Find(Items, item.Value, out _) assumes Value uniquely identifies a node; if multiple nodes can share the same Value, you may want to clarify or strengthen this matching to avoid syncing the wrong item.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `SyncSearchItemCheckedState`, consider reusing existing cascade logic instead of duplicating the `AutoCheckChildren`/`AutoCheckParent` handling to keep all checkbox propagation paths consistent and easier to maintain.
- The lookup in `_treeNodeStateCache.Find(Items, item.Value, out _)` assumes `Value` uniquely identifies a node; if multiple nodes can share the same `Value`, you may want to clarify or strengthen this matching to avoid syncing the wrong item.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.99%. Comparing base (a763d15) to head (a83f3fb).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##              main    #8290      +/-   ##
===========================================
- Coverage   100.00%   99.99%   -0.01%     
===========================================
  Files          769      769              
  Lines        34458    34478      +20     
===========================================
+ Hits         34458    34475      +17     
- Misses           0        3       +3     

Flag	Coverage Δ
BB	99.99% <100.00%> (?)

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