Padding of Minimize/Maximize/Close Buttons is Not Consistent When Using ExtendsContentIntoTitleBar

Describe the bug When using a custom title bar with ExtendsContentIntoTitleBar = true, the size of the title bar buttons changes to 21x46 pixels, instead of the normal 29x45 pixels. This makes the WinUI window look very bad when you have it next to windows with the standard buttons. Because this change also alters the hitbox of the close button, it really messes up the end user’s muscle-memory when they go to close the window. From what I can tell, the icons of the button look to be approximately the right size, the main issue is that the buttons lack a significant amount of top/bottom padding .

Steps to reproduce the bug Create a custom title bar with WinUI.

Expected behavior I expect the title bar buttons to be same size as a normal Windows 10 window.

Screenshots

Version Info

NuGet package version: WinUI 3 - Project Reunion 0.5 Preview: 0.5.0-prerelease

Windows app type:

UWP	Win32
	Yes

Windows 10 version	Saw the problem?
Insider Build (xxxxx)
October 2020 Update (19042)	Yes
May 2020 Update (19041)
November 2019 Update (18363)
May 2019 Update (18362)
October 2018 Update (17763)
April 2018 Update (17134)
Fall Creators Update (16299)
Creators Update (15063)

Device form factor	Saw the problem?
Desktop	Yes
Xbox
Surface Hub
IoT

Additional context None

[FreddyDgh]

Maybe I should clarify - if WinUI wants to change the style of the title bar buttons, that’s fine with me. My main point here is that it should be consistent WITHIN WinUI. If I create two windows WITHIN the same app, it looks ridiculous if their title bar buttons are different.

[StephenLPeters]

@pratikone and @Austin-Lamb