Custom TitleBar is not work well in RTL

Describe the bug

Custom title bar doesn’t work well in Right To Left layout I used the code from the documentation

Below you can see the reaction of the title bar when layout is right to left with different methods:

1. Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride = "fa-IR";

As you can see, the title does not stick to the right side and is as far as the CaptionButtons

2.FlowDirection="RightToLeft"

As you can see, CaptionButtons and title are placed in each other

1. using NativeMethods WS_EX_LAYOUTRTL and SetWindowLong(hWnd, GWL_EXSTYLE, exstyle | WS_EX_LAYOUTRTL)

The drag regions are not correct and the title is still on the left side

1. using NativeMethods WS_EX_LAYOUTRTL and SetWindowLong(hWnd, GWL_EXSTYLE, exstyle | WS_EX_LAYOUTRTL) and FlowDirection="RightToLeft"

Steps to reproduce the bug

create a winui 3 project + full titlebar customization change your app to RTL layout with 3 methods

Expected behavior

Caption buttons should be on the left side, title and icon should be on the right side, Also, the title and icon should be placed on the right without spaces [see first image]

Screenshots

No response

NuGet package version

Windows App SDK 1.3.2: 1.3.230602002

Packaging type

Packaged (MSIX), Unpackaged

Windows version

Windows 11 version 22H2 (22621, 2022 Update)

IDE

Visual Studio 2022

Additional context

No response

[ghost1372]

@pratikone i tested with 1.4-preview1 First of all, there is no right-to-left functionality with C# code! In version 1.3, the app can be set to right to left with the following code: Windows.Globalization.ApplicationLanguages.PrimaryLanguageOverride = "fa-IR"; But in 1.4 no code works except p/invoke Second, I changed app layout to right to left with P/invoke and issue is still exists

[Avid29]

@pratikone I gave it a test in my C# project and it no longer mismatches the buttons visible location from their hitboxes, however it behaves as if it were LTR. Is there a way to set the TitleBar layout/flow direction in the C# API?

Also, in 1.2 when you didn’t enable ExtendsContentIntoTitleBar the titlebar would match the system language’s flow direction. However, in 1.4 that behavior has changed and it will always be LTR.