Improve the looks of 2D/3D viewport contextual toolbars

editor/editor_themes.cpp

@@ -844,13 +844,12 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 	// even though it may not be immediately obvious at first.
 	Ref<StyleBoxFlat> toolbar_stylebox = memnew(StyleBoxFlat);
 	toolbar_stylebox->set_bg_color(accent_color * Color(1, 1, 1, 0.1));
-	toolbar_stylebox->set_corner_radius(CORNER_TOP_LEFT, corner_radius * EDSCALE);
-	toolbar_stylebox->set_corner_radius(CORNER_TOP_RIGHT, corner_radius * EDSCALE);
 	toolbar_stylebox->set_anti_aliased(false);
 	// Add an underline to the StyleBox, but prevent its minimum vertical size from changing.
 	toolbar_stylebox->set_border_color(accent_color);
 	toolbar_stylebox->set_border_width(SIDE_BOTTOM, Math::round(2 * EDSCALE));
 	toolbar_stylebox->set_content_margin(SIDE_BOTTOM, 0);
+	toolbar_stylebox->set_expand_margin_all(2 * EDSCALE);
 	theme->set_stylebox("ContextualToolbar", EditorStringName(EditorStyles), toolbar_stylebox);
 
 	// Script Editor

editor/plugins/abstract_polygon_2d_editor.cpp

@@ -725,7 +725,6 @@ AbstractPolygon2DEditor::AbstractPolygon2DEditor(bool p_wip_destructive) {
 	selected_point = Vertex();
 	edge_point = PosVertex();
 
-	add_child(memnew(VSeparator));
 	button_create = memnew(Button);
 	button_create->set_flat(true);
 	add_child(button_create);

editor/plugins/canvas_item_editor_plugin.cpp

@@ -3888,7 +3888,7 @@ void CanvasItemEditor::_update_editor_settings() {
 	key_auto_insert_button->add_theme_color_override("icon_pressed_color", key_auto_color.lerp(Color(1, 0, 0), 0.55));
 	animation_menu->set_icon(get_editor_theme_icon(SNAME("GuiTabMenuHl")));
 
-	context_menu_panel->add_theme_style_override("panel", get_theme_stylebox(SNAME("ContextualToolbar"), EditorStringName(EditorStyles)));
+	context_toolbar_panel->add_theme_style_override("panel", get_theme_stylebox(SNAME("ContextualToolbar"), EditorStringName(EditorStyles)));
 
 	panner->setup((ViewPanner::ControlScheme)EDITOR_GET("editors/panning/2d_editor_panning_scheme").operator int(), ED_GET_SHORTCUT("canvas_item_editor/pan_view"), bool(EDITOR_GET("editors/panning/simple_panning")));
 	panner->set_scroll_speed(EDITOR_GET("editors/panning/2d_editor_pan_speed"));
@@ -4941,13 +4941,51 @@ void CanvasItemEditor::clear() {
 }
 
 void CanvasItemEditor::add_control_to_menu_panel(Control *p_control) {
-	ERR_FAIL_COND(!p_control);
+	ERR_FAIL_NULL(p_control);
+	ERR_FAIL_COND(p_control->get_parent());
 
-	context_menu_hbox->add_child(p_control);
+	VSeparator *sep = memnew(VSeparator);
+	context_toolbar_hbox->add_child(sep);
+	context_toolbar_hbox->add_child(p_control);
+	context_toolbar_separators[p_control] = sep;
+
+	p_control->connect("visibility_changed", callable_mp(this, &CanvasItemEditor::_update_context_toolbar));
+
+	_update_context_toolbar();
 }
 
 void CanvasItemEditor::remove_control_from_menu_panel(Control *p_control) {
-	context_menu_hbox->remove_child(p_control);
+	ERR_FAIL_NULL(p_control);
+	ERR_FAIL_COND(p_control->get_parent() != context_toolbar_hbox);
+
+	p_control->disconnect("visibility_changed", callable_mp(this, &CanvasItemEditor::_update_context_toolbar));
+
+	context_toolbar_hbox->remove_child(context_toolbar_separators[p_control]);
+	context_toolbar_hbox->remove_child(p_control);
+	context_toolbar_separators.erase(p_control);
+
+	_update_context_toolbar();
+}
+
+void CanvasItemEditor::_update_context_toolbar() {
+	bool has_visible = false;
+	bool first_visible = false;
+
+	for (int i = 0; i < context_toolbar_hbox->get_child_count(); i++) {
+		Control *child = Object::cast_to<Control>(context_toolbar_hbox->get_child(i));
+		if (!child || !context_toolbar_separators.has(child)) {
+			continue;
+		}
+		if (child->is_visible()) {
+			first_visible = !has_visible;
+			has_visible = true;
+		}
+
+		VSeparator *sep = context_toolbar_separators[child];
+		sep->set_visible(!first_visible && child->is_visible());
+	}
+
+	context_toolbar_panel->set_visible(has_visible);
 }
 
 void CanvasItemEditor::add_control_to_left_panel(Control *p_control) {
@@ -4997,9 +5035,17 @@ CanvasItemEditor::CanvasItemEditor() {
 	EditorRunBar::get_singleton()->call_deferred(SNAME("connect"), "play_pressed", callable_mp(this, &CanvasItemEditor::_update_override_camera_button).bind(true));
 	EditorRunBar::get_singleton()->call_deferred(SNAME("connect"), "stop_pressed", callable_mp(this, &CanvasItemEditor::_update_override_camera_button).bind(false));
 
+	// Add some margin to the sides for better aesthetics.
+	// This prevents the first button's hover/pressed effect from "touching" the panel's border,
+	// which looks ugly.
+	MarginContainer *toolbar_margin = memnew(MarginContainer);
+	toolbar_margin->add_theme_constant_override("margin_left", 4 * EDSCALE);
+	toolbar_margin->add_theme_constant_override("margin_right", 4 * EDSCALE);
+	add_child(toolbar_margin);
+
 	// A fluid container for all toolbars.
 	HFlowContainer *main_flow = memnew(HFlowContainer);
-	add_child(main_flow);
+	toolbar_margin->add_child(main_flow);
 
 	// Main toolbars.
 	HBoxContainer *main_menu_hbox = memnew(HBoxContainer);
@@ -5107,13 +5153,6 @@ CanvasItemEditor::CanvasItemEditor() {
 
 	viewport->add_child(controls_vb);
 
-	// Add some margin to the left for better esthetics.
-	// This prevents the first button's hover/pressed effect from "touching" the panel's border,
-	// which looks ugly.
-	Control *margin_left = memnew(Control);
-	main_menu_hbox->add_child(margin_left);
-	margin_left->set_custom_minimum_size(Size2(2, 0) * EDSCALE);
-
 	select_button = memnew(Button);
 	select_button->set_flat(true);
 	main_menu_hbox->add_child(select_button);
@@ -5355,15 +5394,14 @@ CanvasItemEditor::CanvasItemEditor() {
 	main_menu_hbox->add_child(memnew(VSeparator));
 
 	// Contextual toolbars.
-	context_menu_panel = memnew(PanelContainer);
-	context_menu_hbox = memnew(HBoxContainer);
-	context_menu_panel->add_child(context_menu_hbox);
-	main_flow->add_child(context_menu_panel);
+	context_toolbar_panel = memnew(PanelContainer);
+	context_toolbar_hbox = memnew(HBoxContainer);
+	context_toolbar_panel->add_child(context_toolbar_hbox);
+	main_flow->add_child(context_toolbar_panel);
 
 	// Animation controls.
 	animation_hb = memnew(HBoxContainer);
-	context_menu_hbox->add_child(animation_hb);
-	animation_hb->add_child(memnew(VSeparator));
+	add_control_to_menu_panel(animation_hb);
 	animation_hb->hide();
 
 	key_loc_button = memnew(Button);

editor/plugins/canvas_item_editor_plugin.h

@@ -48,6 +48,7 @@ class PanelContainer;
 class StyleBoxTexture;
 class ViewPanner;
 class VScrollBar;
+class VSeparator;
 class VSplitContainer;
 
 class CanvasItemEditorSelectedItem : public Object {
@@ -192,10 +193,14 @@ private:
 
 	HScrollBar *h_scroll = nullptr;
 	VScrollBar *v_scroll = nullptr;
+
 	// Used for secondary menu items which are displayed depending on the currently selected node
 	// (such as MeshInstance's "Mesh" menu).
-	PanelContainer *context_menu_panel = nullptr;
-	HBoxContainer *context_menu_hbox = nullptr;
+	PanelContainer *context_toolbar_panel = nullptr;
+	HBoxContainer *context_toolbar_hbox = nullptr;
+	HashMap<Control *, VSeparator *> context_toolbar_separators;
+
+	void _update_context_toolbar();
 
 	Transform2D transform;
 	GridVisibility grid_visibility = GRID_VISIBILITY_SHOW_WHEN_SNAPPING;

editor/plugins/control_editor_plugin.cpp

@@ -976,8 +976,6 @@ void ControlEditorToolbar::_notification(int p_what) {
 }
 
 ControlEditorToolbar::ControlEditorToolbar() {
-	add_child(memnew(VSeparator));
-
 	// Anchor and offset tools.
 	anchors_button = memnew(ControlEditorPopupButton);
 	anchors_button->set_tooltip_text(TTR("Presets for the anchor and offset values of a Control node."));

editor/plugins/cpu_particles_2d_editor_plugin.cpp

@@ -267,8 +267,6 @@ CPUParticles2DEditorPlugin::CPUParticles2DEditorPlugin() {
 	add_control_to_container(CONTAINER_CANVAS_EDITOR_MENU, toolbar);
 	toolbar->hide();
 
-	toolbar->add_child(memnew(VSeparator));
-
 	menu = memnew(MenuButton);
 	menu->get_popup()->add_item(TTR("Restart"), MENU_RESTART);
 	menu->get_popup()->add_item(TTR("Load Emission Mask"), MENU_LOAD_EMISSION_MASK);

editor/plugins/gpu_particles_2d_editor_plugin.cpp

@@ -369,8 +369,6 @@ GPUParticles2DEditorPlugin::GPUParticles2DEditorPlugin() {
 	add_control_to_container(CONTAINER_CANVAS_EDITOR_MENU, toolbar);
 	toolbar->hide();
 
-	toolbar->add_child(memnew(VSeparator));
-
 	menu = memnew(MenuButton);
 	menu->get_popup()->add_item(TTR("Restart"), MENU_RESTART);
 	menu->get_popup()->add_item(TTR("Generate Visibility Rect"), MENU_GENERATE_VISIBILITY_RECT);

editor/plugins/navigation_obstacle_3d_editor_plugin.cpp

@@ -521,7 +521,6 @@ void NavigationObstacle3DEditor::_bind_methods() {
 NavigationObstacle3DEditor::NavigationObstacle3DEditor() {
 	obstacle_node = nullptr;
 
-	add_child(memnew(VSeparator));
 	button_create = memnew(Button);
 	button_create->set_flat(true);
 	add_child(button_create);

editor/plugins/node_3d_editor_plugin.cpp

@@ -7581,7 +7581,7 @@ void Node3DEditor::_update_theme() {
 	environ_sky_color->set_custom_minimum_size(Size2(0, get_theme_constant(SNAME("color_picker_button_height"), EditorStringName(Editor))));
 	environ_ground_color->set_custom_minimum_size(Size2(0, get_theme_constant(SNAME("color_picker_button_height"), EditorStringName(Editor))));
 
-	context_menu_panel->add_theme_style_override("panel", get_theme_stylebox(SNAME("ContextualToolbar"), EditorStringName(EditorStyles)));
+	context_toolbar_panel->add_theme_style_override("panel", get_theme_stylebox(SNAME("ContextualToolbar"), EditorStringName(EditorStyles)));
 }
 
 void Node3DEditor::_notification(int p_what) {
@@ -7679,11 +7679,51 @@ Vector<int> Node3DEditor::get_subgizmo_selection() {
 }
 
 void Node3DEditor::add_control_to_menu_panel(Control *p_control) {
-	context_menu_hbox->add_child(p_control);
+	ERR_FAIL_NULL(p_control);
+	ERR_FAIL_COND(p_control->get_parent());
+
+	VSeparator *sep = memnew(VSeparator);
+	context_toolbar_hbox->add_child(sep);
+	context_toolbar_hbox->add_child(p_control);
+	context_toolbar_separators[p_control] = sep;
+
+	p_control->connect("visibility_changed", callable_mp(this, &Node3DEditor::_update_context_toolbar));
+
+	_update_context_toolbar();
 }
 
 void Node3DEditor::remove_control_from_menu_panel(Control *p_control) {
-	context_menu_hbox->remove_child(p_control);
+	ERR_FAIL_NULL(p_control);
+	ERR_FAIL_COND(p_control->get_parent() != context_toolbar_hbox);
+
+	p_control->disconnect("visibility_changed", callable_mp(this, &Node3DEditor::_update_context_toolbar));
+
+	context_toolbar_hbox->remove_child(context_toolbar_separators[p_control]);
+	context_toolbar_hbox->remove_child(p_control);
+	context_toolbar_separators.erase(p_control);
+
+	_update_context_toolbar();
+}
+
+void Node3DEditor::_update_context_toolbar() {
+	bool has_visible = false;
+	bool first_visible = false;
+
+	for (int i = 0; i < context_toolbar_hbox->get_child_count(); i++) {
+		Control *child = Object::cast_to<Control>(context_toolbar_hbox->get_child(i));
+		if (!child || !context_toolbar_separators.has(child)) {
+			continue;
+		}
+		if (child->is_visible()) {
+			first_visible = !has_visible;
+			has_visible = true;
+		}
+
+		VSeparator *sep = context_toolbar_separators[child];
+		sep->set_visible(!first_visible && child->is_visible());
+	}
+
+	context_toolbar_panel->set_visible(has_visible);
 }
 
 void Node3DEditor::set_can_preview(Camera3D *p_preview) {
@@ -8161,9 +8201,17 @@ Node3DEditor::Node3DEditor() {
 
 	camera_override_viewport_id = 0;
 
+	// Add some margin to the sides for better aesthetics.
+	// This prevents the first button's hover/pressed effect from "touching" the panel's border,
+	// which looks ugly.
+	MarginContainer *toolbar_margin = memnew(MarginContainer);
+	toolbar_margin->add_theme_constant_override("margin_left", 4 * EDSCALE);
+	toolbar_margin->add_theme_constant_override("margin_right", 4 * EDSCALE);
+	vbc->add_child(toolbar_margin);
+
 	// A fluid container for all toolbars.
 	HFlowContainer *main_flow = memnew(HFlowContainer);
-	vbc->add_child(main_flow);
+	toolbar_margin->add_child(main_flow);
 
 	// Main toolbars.
 	HBoxContainer *main_menu_hbox = memnew(HBoxContainer);
@@ -8171,13 +8219,6 @@ Node3DEditor::Node3DEditor() {
 
 	String sct;
 
-	// Add some margin to the left for better esthetics.
-	// This prevents the first button's hover/pressed effect from "touching" the panel's border,
-	// which looks ugly.
-	Control *margin_left = memnew(Control);
-	main_menu_hbox->add_child(margin_left);
-	margin_left->set_custom_minimum_size(Size2(2, 0) * EDSCALE);
-
 	tool_button[TOOL_MODE_SELECT] = memnew(Button);
 	main_menu_hbox->add_child(tool_button[TOOL_MODE_SELECT]);
 	tool_button[TOOL_MODE_SELECT]->set_toggle_mode(true);
@@ -8365,10 +8406,10 @@ Node3DEditor::Node3DEditor() {
 
 	main_menu_hbox->add_child(memnew(VSeparator));
 
-	context_menu_panel = memnew(PanelContainer);
-	context_menu_hbox = memnew(HBoxContainer);
-	context_menu_panel->add_child(context_menu_hbox);
-	main_flow->add_child(context_menu_panel);
+	context_toolbar_panel = memnew(PanelContainer);
+	context_toolbar_hbox = memnew(HBoxContainer);
+	context_toolbar_panel->add_child(context_toolbar_hbox);
+	main_flow->add_child(context_toolbar_panel);
 
 	// Get the view menu popup and have it stay open when a checkable item is selected
 	p = view_menu->get_popup();

editor/plugins/node_3d_editor_plugin.h

@@ -56,9 +56,10 @@ class PanelContainer;
 class ProceduralSkyMaterial;
 class SubViewport;
 class SubViewportContainer;
+class VSeparator;
 class VSplitContainer;
-class WorldEnvironment;
 class ViewportNavigationControl;
+class WorldEnvironment;
 
 class ViewportRotationControl : public Control {
 	GDCLASS(ViewportRotationControl, Control);
@@ -715,8 +716,11 @@ private:
 	void _update_camera_override_viewport(Object *p_viewport);
 	// Used for secondary menu items which are displayed depending on the currently selected node
 	// (such as MeshInstance's "Mesh" menu).
-	PanelContainer *context_menu_panel = nullptr;
-	HBoxContainer *context_menu_hbox = nullptr;
+	PanelContainer *context_toolbar_panel = nullptr;
+	HBoxContainer *context_toolbar_hbox = nullptr;
+	HashMap<Control *, VSeparator *> context_toolbar_separators;
+
+	void _update_context_toolbar();
 
 	void _generate_selection_boxes();
 

editor/plugins/path_2d_editor_plugin.cpp

@@ -532,19 +532,14 @@ Path2DEditor::Path2DEditor() {
 	mode = MODE_EDIT;
 	action = ACTION_NONE;
 
-	base_hb = memnew(HBoxContainer);
-	CanvasItemEditor::get_singleton()->add_control_to_menu_panel(base_hb);
-
-	sep = memnew(VSeparator);
-	base_hb->add_child(sep);
-
 	curve_edit = memnew(Button);
 	curve_edit->set_flat(true);
 	curve_edit->set_toggle_mode(true);
+	curve_edit->set_pressed(true);
 	curve_edit->set_focus_mode(Control::FOCUS_NONE);
 	curve_edit->set_tooltip_text(TTR("Select Points") + "\n" + TTR("Shift+Drag: Select Control Points") + "\n" + keycode_get_string((Key)KeyModifierMask::CMD_OR_CTRL) + TTR("Click: Add Point") + "\n" + TTR("Left Click: Split Segment (in curve)") + "\n" + TTR("Right Click: Delete Point"));
 	curve_edit->connect("pressed", callable_mp(this, &Path2DEditor::_mode_selected).bind(MODE_EDIT));
-	base_hb->add_child(curve_edit);
+	add_child(curve_edit);
 
 	curve_edit_curve = memnew(Button);
 	curve_edit_curve->set_flat(true);
@@ -552,7 +547,7 @@ Path2DEditor::Path2DEditor() {
 	curve_edit_curve->set_focus_mode(Control::FOCUS_NONE);
 	curve_edit_curve->set_tooltip_text(TTR("Select Control Points (Shift+Drag)"));
 	curve_edit_curve->connect("pressed", callable_mp(this, &Path2DEditor::_mode_selected).bind(MODE_EDIT_CURVE));
-	base_hb->add_child(curve_edit_curve);
+	add_child(curve_edit_curve);
 
 	curve_create = memnew(Button);
 	curve_create->set_flat(true);
@@ -560,7 +555,7 @@ Path2DEditor::Path2DEditor() {
 	curve_create->set_focus_mode(Control::FOCUS_NONE);
 	curve_create->set_tooltip_text(TTR("Add Point (in empty space)"));
 	curve_create->connect("pressed", callable_mp(this, &Path2DEditor::_mode_selected).bind(MODE_CREATE));
-	base_hb->add_child(curve_create);
+	add_child(curve_create);
 
 	curve_del = memnew(Button);
 	curve_del->set_flat(true);
@@ -568,20 +563,20 @@ Path2DEditor::Path2DEditor() {
 	curve_del->set_focus_mode(Control::FOCUS_NONE);
 	curve_del->set_tooltip_text(TTR("Delete Point"));
 	curve_del->connect("pressed", callable_mp(this, &Path2DEditor::_mode_selected).bind(MODE_DELETE));
-	base_hb->add_child(curve_del);
+	add_child(curve_del);
 
 	curve_close = memnew(Button);
 	curve_close->set_flat(true);
 	curve_close->set_focus_mode(Control::FOCUS_NONE);
 	curve_close->set_tooltip_text(TTR("Close Curve"));
 	curve_close->connect("pressed", callable_mp(this, &Path2DEditor::_mode_selected).bind(ACTION_CLOSE));
-	base_hb->add_child(curve_close);
+	add_child(curve_close);
 
 	PopupMenu *menu;
 
 	handle_menu = memnew(MenuButton);
 	handle_menu->set_text(TTR("Options"));
-	base_hb->add_child(handle_menu);
+	add_child(handle_menu);
 
 	menu = handle_menu->get_popup();
 	menu->add_check_item(TTR("Mirror Handle Angles"));
@@ -589,10 +584,6 @@ Path2DEditor::Path2DEditor() {
 	menu->add_check_item(TTR("Mirror Handle Lengths"));
 	menu->set_item_checked(HANDLE_OPTION_LENGTH, mirror_handle_length);
 	menu->connect("id_pressed", callable_mp(this, &Path2DEditor::_handle_option_pressed));
-
-	base_hb->hide();
-
-	curve_edit->set_pressed(true);
 }
 
 void Path2DEditorPlugin::edit(Object *p_object) {
@@ -606,11 +597,9 @@ bool Path2DEditorPlugin::handles(Object *p_object) const {
 void Path2DEditorPlugin::make_visible(bool p_visible) {
 	if (p_visible) {
 		path2d_editor->show();
-		path2d_editor->base_hb->show();
 
 	} else {
 		path2d_editor->hide();
-		path2d_editor->base_hb->hide();
 		path2d_editor->edit(nullptr);
 	}
 }

editor/plugins/path_2d_editor_plugin.h

@@ -34,7 +34,6 @@
 #include "editor/editor_plugin.h"
 #include "scene/2d/path_2d.h"
 #include "scene/gui/box_container.h"
-#include "scene/gui/separator.h"
 
 class CanvasItemEditor;
 class MenuButton;
@@ -47,7 +46,6 @@ class Path2DEditor : public HBoxContainer {
 	Path2D *node = nullptr;
 
 	HBoxContainer *base_hb = nullptr;
-	Separator *sep = nullptr;
 
 	enum Mode {
 		MODE_CREATE,

editor/plugins/path_3d_editor_plugin.cpp

@@ -623,21 +623,9 @@ bool Path3DEditorPlugin::handles(Object *p_object) const {
 
 void Path3DEditorPlugin::make_visible(bool p_visible) {
 	if (p_visible) {
-		curve_create->show();
-		curve_edit->show();
-		curve_edit_curve->show();
-		curve_del->show();
-		curve_close->show();
-		handle_menu->show();
-		sep->show();
+		topmenu_bar->show();
 	} else {
-		curve_create->hide();
-		curve_edit->hide();
-		curve_edit_curve->hide();
-		curve_del->hide();
-		curve_close->hide();
-		handle_menu->hide();
-		sep->hide();
+		topmenu_bar->hide();
 
 		{
 			Path3D *pre = path;
@@ -736,55 +724,49 @@ Path3DEditorPlugin::Path3DEditorPlugin() {
 	gizmo_plugin.instantiate();
 	Node3DEditor::get_singleton()->add_gizmo_plugin(gizmo_plugin);
 
-	sep = memnew(VSeparator);
-	sep->hide();
-	Node3DEditor::get_singleton()->add_control_to_menu_panel(sep);
+	topmenu_bar = memnew(HBoxContainer);
+	topmenu_bar->hide();
+	Node3DEditor::get_singleton()->add_control_to_menu_panel(topmenu_bar);
 
 	curve_edit = memnew(Button);
 	curve_edit->set_flat(true);
 	curve_edit->set_toggle_mode(true);
-	curve_edit->hide();
 	curve_edit->set_focus_mode(Control::FOCUS_NONE);
 	curve_edit->set_tooltip_text(TTR("Select Points") + "\n" + TTR("Shift+Drag: Select Control Points") + "\n" + keycode_get_string((Key)KeyModifierMask::CMD_OR_CTRL) + TTR("Click: Add Point") + "\n" + TTR("Right Click: Delete Point"));
-	Node3DEditor::get_singleton()->add_control_to_menu_panel(curve_edit);
+	topmenu_bar->add_child(curve_edit);
 
 	curve_edit_curve = memnew(Button);
 	curve_edit_curve->set_flat(true);
 	curve_edit_curve->set_toggle_mode(true);
-	curve_edit_curve->hide();
 	curve_edit_curve->set_focus_mode(Control::FOCUS_NONE);
 	curve_edit_curve->set_tooltip_text(TTR("Select Control Points (Shift+Drag)"));
-	Node3DEditor::get_singleton()->add_control_to_menu_panel(curve_edit_curve);
+	topmenu_bar->add_child(curve_edit_curve);
 
 	curve_create = memnew(Button);
 	curve_create->set_flat(true);
 	curve_create->set_toggle_mode(true);
-	curve_create->hide();
 	curve_create->set_focus_mode(Control::FOCUS_NONE);
 	curve_create->set_tooltip_text(TTR("Add Point (in empty space)") + "\n" + TTR("Split Segment (in curve)"));
-	Node3DEditor::get_singleton()->add_control_to_menu_panel(curve_create);
+	topmenu_bar->add_child(curve_create);
 
 	curve_del = memnew(Button);
 	curve_del->set_flat(true);
 	curve_del->set_toggle_mode(true);
-	curve_del->hide();
 	curve_del->set_focus_mode(Control::FOCUS_NONE);
 	curve_del->set_tooltip_text(TTR("Delete Point"));
-	Node3DEditor::get_singleton()->add_control_to_menu_panel(curve_del);
+	topmenu_bar->add_child(curve_del);
 
 	curve_close = memnew(Button);
 	curve_close->set_flat(true);
-	curve_close->hide();
 	curve_close->set_focus_mode(Control::FOCUS_NONE);
 	curve_close->set_tooltip_text(TTR("Close Curve"));
-	Node3DEditor::get_singleton()->add_control_to_menu_panel(curve_close);
+	topmenu_bar->add_child(curve_close);
 
 	PopupMenu *menu;
 
 	handle_menu = memnew(MenuButton);
 	handle_menu->set_text(TTR("Options"));
-	handle_menu->hide();
-	Node3DEditor::get_singleton()->add_control_to_menu_panel(handle_menu);
+	topmenu_bar->add_child(handle_menu);
 
 	menu = handle_menu->get_popup();
 	menu->add_check_item(TTR("Mirror Handle Angles"));

editor/plugins/path_3d_editor_plugin.h

@@ -35,8 +35,8 @@
 #include "editor/plugins/node_3d_editor_gizmos.h"
 #include "scene/3d/camera_3d.h"
 #include "scene/3d/path_3d.h"
-#include "scene/gui/separator.h"
 
+class HBoxContainer;
 class MenuButton;
 
 class Path3DGizmo : public EditorNode3DGizmo {
@@ -87,7 +87,7 @@ public:
 class Path3DEditorPlugin : public EditorPlugin {
 	GDCLASS(Path3DEditorPlugin, EditorPlugin);
 
-	Separator *sep = nullptr;
+	HBoxContainer *topmenu_bar = nullptr;
 	Button *curve_create = nullptr;
 	Button *curve_edit = nullptr;
 	Button *curve_edit_curve = nullptr;

editor/plugins/physical_bone_3d_editor_plugin.cpp

@@ -53,8 +53,6 @@ PhysicalBone3DEditor::PhysicalBone3DEditor() {
 	spatial_editor_hb->set_alignment(BoxContainer::ALIGNMENT_BEGIN);
 	Node3DEditor::get_singleton()->add_control_to_menu_panel(spatial_editor_hb);
 
-	spatial_editor_hb->add_child(memnew(VSeparator));
-
 	button_transform_joint = memnew(Button);
 	button_transform_joint->set_flat(true);
 	spatial_editor_hb->add_child(button_transform_joint);

editor/plugins/polygon_3d_editor_plugin.cpp

@@ -536,7 +536,6 @@ void Polygon3DEditor::_bind_methods() {
 Polygon3DEditor::Polygon3DEditor() {
 	node = nullptr;
 
-	add_child(memnew(VSeparator));
 	button_create = memnew(Button);
 	button_create->set_flat(true);
 	add_child(button_create);

editor/plugins/skeleton_3d_editor_plugin.cpp

@@ -712,12 +712,12 @@ void Skeleton3DEditor::create_editors() {
 	add_child(file_dialog);
 
 	// Create Top Menu Bar.
-	separator = memnew(VSeparator);
-	ne->add_control_to_menu_panel(separator);
+	HBoxContainer *topmenu_bar = memnew(HBoxContainer);
+	ne->add_control_to_menu_panel(topmenu_bar);
 
 	// Create Skeleton Option in Top Menu Bar.
 	skeleton_options = memnew(MenuButton);
-	ne->add_control_to_menu_panel(skeleton_options);
+	topmenu_bar->add_child(skeleton_options);
 
 	skeleton_options->set_text(TTR("Skeleton3D"));
 
@@ -737,7 +737,7 @@ void Skeleton3DEditor::create_editors() {
 	button_binds.resize(1);
 
 	edit_mode_button = memnew(Button);
-	ne->add_control_to_menu_panel(edit_mode_button);
+	topmenu_bar->add_child(edit_mode_button);
 	edit_mode_button->set_flat(true);
 	edit_mode_button->set_toggle_mode(true);
 	edit_mode_button->set_focus_mode(FOCUS_NONE);
@@ -753,7 +753,7 @@ void Skeleton3DEditor::create_editors() {
 
 	// Keying buttons.
 	animation_hb = memnew(HBoxContainer);
-	ne->add_control_to_menu_panel(animation_hb);
+	topmenu_bar->add_child(animation_hb);
 	animation_hb->add_child(memnew(VSeparator));
 	animation_hb->hide();