CtrlCore: Attemt at fixing xwayland cursor

uppsrc/CtrlCore/GtkWnd.cpp

@@ -109,6 +109,8 @@ void  Ctrl::SetMouseCursor(const Image& image)
 #endif
 		}
 		if(c && topctrl->IsOpen()) {
+			static GdkCursor *blank_cursor = gdk_cursor_new_for_display(gdk_display_get_default(), GDK_BLANK_CURSOR);
+			gdk_window_set_cursor(topctrl->gdk(), blank_cursor); // should help in [x]wayland
 			gdk_window_set_cursor(topctrl->gdk(), c);
 			g_object_unref(c);
 			if(IsXWayland()) // xwayland is broken, need some paint to change the cursor...

upptst/CursorImage/CursorImage.upp

@@ -0,0 +1,9 @@
+uses
+	CtrlLib;
+
+file
+	main.cpp;
+
+mainconfig
+	"" = "GUI";
+

upptst/CursorImage/main.cpp

@@ -0,0 +1,21 @@
+#include <CtrlLib/CtrlLib.h>
+
+using namespace Upp;
+
+struct MyApp : TopWindow {
+	void Paint(Draw& w) override {
+		w.DrawRect(GetSize(), White());
+	}
+
+	Image CursorImage(Point p, dword keyflags) override {
+		if(p.x < GetSize().cx / 2)
+			return Image::Hand();
+		else
+			return CtrlImg::HelpCursor0();
+	}
+};
+
+GUI_APP_MAIN
+{
+	MyApp().Run();
+}