fix(MultiSelect): keep last value when items is null

[ArgoZhang]

Link issues

fixes #6921

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

Bug Fixes:

• Reset _lastSelectedValueString to an empty string when SelectedItems is empty in OnParametersSet.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This change ensures the MultiSelect component clears its internal lastSelectedValueString when no items remain selected, preventing stale values from persisting when Items becomes null or empty.

Class diagram for updated MultiSelect component logic

classDiagram
    class MultiSelect {
        - _currentValue : string
        - SelectedItems : List<Item>
        - Rows : List<Item>
        - _lastSelectedValueString : string
        + OnParametersSet()
    }
    MultiSelect : OnParametersSet()
    MultiSelect : _lastSelectedValueString is cleared when SelectedItems.Count == 0

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File-Level Changes

Change	Details	Files
Reset internal lastSelectedValueString when no selections exist	Added a conditional block checking if SelectedItems.Count == 0 Assigned an empty string to _lastSelectedValueString within that block	src/BootstrapBlazor/Components/Select/MultiSelect.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6921	Support null Items parameter in MultiSelect component.	✅

Possibly linked issues

• feat(MultiSelect): support null Items parameter #6921: The PR fixes MultiSelect not updating/clearing selected values by ensuring the last selected value string is cleared when no items are selected.
• feat(MultiSelect): support null Items parameter #6921: The PR fixes the MultiSelect display bug in the table's edit pop-up by ensuring the last selected value string is cleared when no items are selected, directly addressing the issue's symptoms.

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[Copilot]

Pull Request Overview

This PR fixes a bug in the MultiSelect component where the last selected value was not being properly cleared when no items are available or selected. The fix ensures that when no items are selected, the internal _lastSelectedValueString field is reset to an empty string to maintain consistent state.

Key Changes

• Added a null check and reset logic for _lastSelectedValueString when SelectedItems is empty

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[sourcery-ai]

Hey there - I've reviewed your changes - here's some feedback:

• Add a null check for Rows before iterating to prevent NullReferenceExceptions when the items collection is null.
• Instead of unconditionally clearing _lastSelectedValueString when no items are selected, consider preserving its previous value to avoid losing user input if the list is temporarily empty.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Add a null check for Rows before iterating to prevent NullReferenceExceptions when the items collection is null.
- Instead of unconditionally clearing _lastSelectedValueString when no items are selected, consider preserving its previous value to avoid losing user input if the list is temporarily empty.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b187f2b) to head (89a28e9).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6924   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          740       740           
  Lines        31811     31815    +4     
  Branches      4468      4469    +1     
=========================================
+ Hits         31811     31815    +4     

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

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