fixed(MultiSelect)清理分组状态下Divider重叠

[Tony-ST0754]

refactor:清理分组状态下生成多余的Divider组件信息

Link issues

fixes #8167

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

Resolve overlapping dividers in MultiSelect when using grouped options by removing redundant group divider rendering.

Bug Fixes:

• Prevent duplicate dividers from being rendered under grouped MultiSelect items, eliminating visual overlap.

Enhancements:

• Simplify MultiSelect grouped rendering logic by removing unnecessary group footer divider output.

[bb-auto]

Thanks for your PR, @Tony-ST0754. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Removes redundant group-level Divider rendering in MultiSelect’s grouped state to prevent overlapping dividers while keeping item row rendering intact.

Flow diagram for updated MultiSelect grouped rendering without Divider

flowchart TD
    A[RenderMultiSelectGrouped] --> B[For each itemGroup]
    B --> C[For each item in itemGroup]
    C --> D[RenderRow item]
    %% group-level Divider / GroupItemTemplate rendering removed in grouped state

Loading

File-Level Changes

Change	Details	Files
Stop rendering a Divider or GroupItemTemplate after each item group to eliminate duplicated separators in grouped MultiSelect dropdowns.	Removed the conditional block that rendered GroupItemTemplate or a Divider after iterating through each item group’s items Left the item row rendering loop intact so grouped items still render correctly	src/BootstrapBlazor/Components/Select/MultiSelect.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8167	Fix the MultiSelect grouped mode so that Divider components do not overlap between consecutive groups (by removing redundant Divider rendering or otherwise spacing them correctly).	✅

Possibly linked issues

• bug(MultiSelect): 在分组模式下内部 Divider 组件重叠 #8167: PR removes redundant Divider rendering in MultiSelect group mode, fixing the overlapping Divider bug from the issue.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.79%. Comparing base (68ff235) to head (8b4e0c5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8168      +/-   ##
==========================================
- Coverage   98.79%   98.79%   -0.01%     
==========================================
  Files         766      766              
  Lines       34230    34221       -9     
  Branches     4701     4699       -2     
==========================================
- Hits        33816    33807       -9     
  Partials      414      414              

Flag	Coverage Δ
BB	98.79% <ø> (?)

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