Add Window::HideTitlebar and ShowTitlebar

include/JUI/Widgets/Window.hpp

@@ -55,6 +55,19 @@ namespace JUI {
         // TODO: Decide if this will auto-scale with the titlebar's text height, or the other way around.
         [[nodiscard]] int TitlebarHeight() const;
 
+        void HideTitlebar() {
+            titlebar_hidden = true;
+
+            Topbar->Visible(false);
+        }
+        void ShowTitlebar() {
+            titlebar_hidden = false;
+
+            Topbar->Visible(true);
+        }
+
+
+
 
         /// @return True if this window widget is on-top of all other window-widgets with the same parent.
         bool OnTop() const;
@@ -187,6 +200,7 @@ namespace JUI {
         bool open = false;
         //bool resizing = false;
         bool draggable = true;
+        bool titlebar_hidden = false;
         bool dockable = false;
         int titlebar_height = Style::Window::TitlebarHeight;
         int title_font_size = 16;