SciterAPIHost.CreateMainWindow parameters width and height is optional now, if it omit windows take half of current screen and center window

Author: trueromanus

EmptyFlow.SciterAPI/Client/SciterAPIHost.cs

@@ -101,22 +101,28 @@ public static IntPtr WindowsDelegateImplementaion ( IntPtr hwnd, uint msg, IntPt
             return 0;
         }
 
-        public void CreateMainWindow ( int width, int height, bool enableDebug = false, bool enableFeature = false ) {
+        public void CreateMainWindow ( int width = 0, int height = 0, bool enableDebug = false, bool enableFeature = false ) {
             if ( enableDebug ) m_basicApi.SciterSetOption ( IntPtr.Zero, RtOptions.SCITER_SET_DEBUG_MODE, new IntPtr ( 1 ) );
             if ( enableFeature ) m_basicApi.SciterSetOption ( IntPtr.Zero, RtOptions.SCITER_SET_SCRIPT_RUNTIME_FEATURES, new IntPtr ( (int) DefaultRuntimeFeatures ) );
 
-            var rectangle = new SciterRectangle ( 0, 0, width, height );
-
+            var rectangePointer = nint.Zero;
+            if ( width > 0 && height > 0 ) {
+                var rectangle = new SciterRectangle ( 0, 0, width, height );
+                rectangePointer = Marshal.AllocHGlobal ( Marshal.SizeOf<SciterRectangle> () );
+                Marshal.StructureToPtr ( rectangle, rectangePointer, false );
+            }
             var ptr = Marshal.GetFunctionPointerForDelegate<WindowDelegate> ( WindowsDelegateImplementaion );
 
             m_mainWindow = m_basicApi.SciterCreateWindow (
                 WindowsFlags.Main | WindowsFlags.Resizeable | WindowsFlags.Titlebar | WindowsFlags.Controls,
-                ref rectangle,
+                rectangePointer,
                 RuntimeInformation.IsOSPlatform ( OSPlatform.Windows ) ? ptr : IntPtr.Zero,
                 IntPtr.Zero,
                 IntPtr.Zero
             );
 
+            if ( rectangePointer != nint.Zero) Marshal.FreeHGlobal ( rectangePointer );
+
             if ( enableDebug ) {
                 m_basicApi.SciterSetupDebugOutput (
                     m_mainWindow,