There is a Gap when the title bar is set to RTL

[ghost1372]

Describe the bug

related to #8671 and #8671 (comment)
for changing layout to RTL we need to use WS_EX_LAYOUTRTL + FlowDirection (both) and this is result:

as you can see there is a gap! which is not expected.

Steps to reproduce the bug

1.create a custom titlebar app
2.change layout to rtl

Expected behavior

titlebar layout should be changed to rtl without gap

Screenshots

No response

NuGet package version

WinUI 3 - Windows App SDK 1.4.3: 1.4.231115000

Windows version

Windows 11 (22H2): Build 22621

Additional context

No response