WinUI 3 - Unable to click X by going to the top right of a maximized window using custom title bar

[nlogozzo]

Describe the bug

Using this guide to create a tall titlebar: https://learn.microsoft.com/en-us/windows/apps/develop/title-bar?tabs=wasdk#system-caption-buttons

Steps to reproduce the bug

1. Follow this guide to create a custom title bar: https://learn.microsoft.com/en-us/windows/apps/develop/title-bar?tabs=wasdk
2. Run the app and maximize the window
3. Drag your mouse to the top right of the screen and see that the X button is not activated

Recording.2023-09-29.124036.mp4

You can see from this video, my app that uses a tall title bar and PowerToys which uses a regular sized title bar (both with WinUI 3) are unable to click the close caption button when moving the mouse to the very top right of the screen.

Unlike Store (as shown in the capture) that is able to click the X button no problem.

Expected behavior

WinUI 3 apps with custom title bars should accept the mouse in the very top right of the screen and be able to click the close caption button as seen in Store, Settings, and every other WinUI 3 app.

Screenshots

Recording.2023-09-29.124036.mp4

NuGet package version

WinUI 3 - Windows App SDK 1.4.1: 1.4.230913002

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response

[MSEDGE-CORE]

It might be forgotten to remove window-resizing area in maxmized window. It's also not available to move window by dragging at the very top of the TitleBar.

[Jay-o-Way]

I assume this isn't fixed just yet?

[codendone]

A fix has been checked in. Using #8665 as the main tracking bug.