AdvancedCollection inserts element at wrong position when the element is added at the end of the source collection

[Poker-sang]

Describe the bug

This means if the new item is at the end of source

Windows/components/Collections/src/AdvancedCollectionView/AdvancedCollectionView.cs

Lines 699 to 702 in 8e4bd7a

	else if (newStartingIndex == _source.Count - 1)
	{
	newViewIndex = _view.Count - 1;
	}

Then we insert it into the penultimate position of the view. It is wired.

Windows/components/Collections/src/AdvancedCollectionView/AdvancedCollectionView.cs

Line 725 in 8e4bd7a

_view.Insert(newViewIndex, newItem);

Isn't it meant to be inserted into the last position?

Steps to reproduce

None.

Expected behavior

None.

Screenshots

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Code Platform

• UWP
• 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

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Visual Studio Build Number

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Device form factor

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Additional context

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