Doubled buttons on transparent background window

[GliczDev]

Describe the bug

Window with transparent background has doubled buttons

Steps to reproduce the bug

Create window with transparent background and see effect

Expected behavior

Not doubled buttons

Screenshots

NuGet package version

HandyControls (Custom version) 3.4.0

IDE

Visual Studio 2022-preview

Framework type

.Net 6.0

Windows version

Insider Build (xxxxx)

Additional context

No response

[MesuDevastator]

+same doubled buttons

[GliczDev]

Okay, so i've made a research, and this should fix this problem

private const int GWL_STYLE = -16;
private const int WS_SYSMENU = 0x80000;
[DllImport("user32.dll", SetLastError = true)]
private static extern int GetWindowLong(IntPtr hWnd, int nIndex);
[DllImport("user32.dll")]
private static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

public static void FixBackground(Window window)
{
    var hwnd = new WindowInteropHelper(window).Handle;
    SetWindowLong(hwnd, GWL_STYLE, GetWindowLong(hwnd, GWL_STYLE) & ~WS_SYSMENU);
}