LibGUI: Make class_name() public so you can always call it.

I found myself having to cast to GWidget* all the time when writing some
generic debugging code that just wanted to dump widget info.

LibGUI/GButton.h

@@ -23,6 +23,8 @@ public:
     void set_button_style(GButtonStyle style) { m_button_style = style; }
     GButtonStyle button_style() const { return m_button_style; }
 
+    virtual const char* class_name() const override { return "GButton"; }
+
 private:
     virtual void paint_event(GPaintEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
@@ -31,8 +33,6 @@ private:
     virtual void enter_event(GEvent&) override;
     virtual void leave_event(GEvent&) override;
 
-    virtual const char* class_name() const override { return "GButton"; }
-
     String m_caption;
     RetainPtr<GraphicsBitmap> m_icon;
     GButtonStyle m_button_style { GButtonStyle::Normal };

LibGUI/GCheckBox.h

@@ -17,13 +17,14 @@ public:
 
     Function<void(GCheckBox&, bool)> on_change;
 
+    virtual const char* class_name() const override { return "GCheckBox"; }
+
 private:
     virtual void paint_event(GPaintEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
     virtual void mouseup_event(GMouseEvent&) override;
     virtual void mousemove_event(GMouseEvent&) override;
     virtual void keydown_event(GKeyEvent&) override;
-    virtual const char* class_name() const override { return "GCheckBox"; }
     virtual bool accepts_focus() const override { return true; }
 
     String m_caption;

LibGUI/GFilePicker.h

@@ -5,6 +5,7 @@ public:
     GFilePicker();
     virtual ~GFilePicker() override;
 
-private:
     virtual const char* class_name() const override { return "GFilePicker"; }
+
+private:
 };

LibGUI/GLabel.h

@@ -22,11 +22,11 @@ public:
     TextAlignment text_alignment() const { return m_text_alignment; }
     void set_text_alignment(TextAlignment text_alignment) { m_text_alignment = text_alignment; }
 
+    virtual const char* class_name() const override { return "GLabel"; }
+
 private:
     virtual void paint_event(GPaintEvent&) override;
 
-    virtual const char* class_name() const override { return "GLabel"; }
-
     String m_text;
     RetainPtr<GraphicsBitmap> m_icon;
     TextAlignment m_text_alignment { TextAlignment::Center };

LibGUI/GListBox.h

@@ -10,10 +10,11 @@ public:
     void add_item(String&&);
     int selected_index() const { return m_selected_index; }
 
+    virtual const char* class_name() const override { return "GListBox"; }
+
 private:
     virtual void paint_event(GPaintEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
-    virtual const char* class_name() const override { return "GListBox"; }
     virtual bool accepts_focus() const override { return true; }
 
     Rect item_rect(int index) const;

LibGUI/GScrollBar.h

@@ -24,12 +24,13 @@ public:
 
     Function<void(int)> on_change;
 
+    virtual const char* class_name() const override { return "GScrollBar"; }
+
 private:
     virtual void paint_event(GPaintEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
     virtual void mouseup_event(GMouseEvent&) override;
     virtual void mousemove_event(GMouseEvent&) override;
-    virtual const char* class_name() const override { return "GScrollBar"; }
 
     int button_size() const { return orientation() == Orientation::Vertical ? width() : height(); }
     Rect up_button_rect() const;

LibGUI/GStackWidget.h

@@ -10,12 +10,12 @@ public:
     GWidget* active_widget() const { return m_active_widget; }
     void set_active_widget(GWidget*);
 
+    virtual const char* class_name() const override { return "GStackWidget"; }
+
 protected:
     virtual void child_event(GChildEvent&) override;
     virtual void resize_event(GResizeEvent&) override;
 
 private:
-    virtual const char* class_name() const override { return "GStackWidget"; }
-
     GWidget* m_active_widget { nullptr };
 };

LibGUI/GStatusBar.h

@@ -12,8 +12,9 @@ public:
     String text() const;
     void set_text(String&&);
 
-private:
     virtual const char* class_name() const override { return "GStatusBar"; }
+
+private:
     virtual void paint_event(GPaintEvent&) override;
 
     GLabel* m_label { nullptr };

LibGUI/GTextBox.h

@@ -14,8 +14,9 @@ public:
     Function<void(GTextBox&)> on_return_pressed;
     Function<void(GTextBox&)> on_change;
 
-private:
     virtual const char* class_name() const override { return "GTextBox"; }
+
+private:
     virtual void paint_event(GPaintEvent&) override;
     virtual void mousedown_event(GMouseEvent&) override;
     virtual void keydown_event(GKeyEvent&) override;

LibGUI/GTextEditor.h

@@ -100,6 +100,8 @@ public:
 
     Function<void(GTextEditor&)> on_return_pressed;
 
+    virtual const char* class_name() const override { return "GTextEditor"; }
+
 private:
     virtual void paint_event(GPaintEvent&) override;
     virtual void resize_event(GResizeEvent&) override;

LibGUI/GToolBar.h

@@ -12,8 +12,9 @@ public:
     void add_action(Retained<GAction>&&);
     void add_separator();
 
-private:
     virtual const char* class_name() const override { return "GToolBar"; }
+
+private:
     virtual void paint_event(GPaintEvent&) override;
 
     struct Item {