Ensure hiding AcceptDialog OK button keeps other buttons centered

scene/gui/dialogs.cpp

@@ -329,10 +329,10 @@ void AcceptDialog::_custom_action(const String &p_action) {
 	custom_action(p_action);
 }
 
-void AcceptDialog::_custom_button_visibility_changed(Button *button) {
-	Control *right_spacer = Object::cast_to<Control>(button->get_meta("__right_spacer"));
-	if (right_spacer) {
-		right_spacer->set_visible(button->is_visible());
+void AcceptDialog::_button_visibility_changed(Button *button) {
+	Control *bound_spacer = Object::cast_to<Control>(button->get_meta("__bound_spacer"));
+	if (bound_spacer) {
+		bound_spacer->set_visible(button->is_visible());
 	}
 }
 
@@ -340,18 +340,18 @@ Button *AcceptDialog::add_button(const String &p_text, bool p_right, const Strin
 	Button *button = memnew(Button);
 	button->set_text(p_text);
 
-	Control *right_spacer;
+	Control *bound_spacer;
 	if (p_right) {
 		buttons_hbox->add_child(button);
-		right_spacer = buttons_hbox->add_spacer();
+		bound_spacer = buttons_hbox->add_spacer();
 	} else {
 		buttons_hbox->add_child(button);
 		buttons_hbox->move_child(button, 0);
-		right_spacer = buttons_hbox->add_spacer(true);
+		bound_spacer = buttons_hbox->add_spacer(true);
 	}
-	button->set_meta("__right_spacer", right_spacer);
+	button->set_meta("__bound_spacer", bound_spacer);
 
-	button->connect(SceneStringName(visibility_changed), callable_mp(this, &AcceptDialog::_custom_button_visibility_changed).bind(button));
+	button->connect(SceneStringName(visibility_changed), callable_mp(this, &AcceptDialog::_button_visibility_changed).bind(button));
 
 	child_controls_changed();
 	if (is_visible()) {
@@ -383,12 +383,12 @@ void AcceptDialog::remove_button(Button *p_button) {
 	ERR_FAIL_COND_MSG(p_button->get_parent() != buttons_hbox, vformat("Cannot remove button %s as it does not belong to this dialog.", p_button->get_name()));
 	ERR_FAIL_COND_MSG(p_button == ok_button, "Cannot remove dialog's OK button.");
 
-	Control *right_spacer = Object::cast_to<Control>(p_button->get_meta("__right_spacer"));
-	if (right_spacer) {
-		ERR_FAIL_COND_MSG(right_spacer->get_parent() != buttons_hbox, vformat("Cannot remove button %s as its associated spacer does not belong to this dialog.", p_button->get_name()));
+	Control *bound_spacer = Object::cast_to<Control>(p_button->get_meta("__bound_spacer"));
+	if (bound_spacer) {
+		ERR_FAIL_COND_MSG(bound_spacer->get_parent() != buttons_hbox, vformat("Cannot remove button %s as its associated spacer does not belong to this dialog.", p_button->get_name()));
 	}
 
-	p_button->disconnect(SceneStringName(visibility_changed), callable_mp(this, &AcceptDialog::_custom_button_visibility_changed));
+	p_button->disconnect(SceneStringName(visibility_changed), callable_mp(this, &AcceptDialog::_button_visibility_changed));
 	if (p_button->is_connected(SceneStringName(pressed), callable_mp(this, &AcceptDialog::_custom_action))) {
 		p_button->disconnect(SceneStringName(pressed), callable_mp(this, &AcceptDialog::_custom_action));
 	}
@@ -396,10 +396,10 @@ void AcceptDialog::remove_button(Button *p_button) {
 		p_button->disconnect(SceneStringName(pressed), callable_mp(this, &AcceptDialog::_cancel_pressed));
 	}
 
-	if (right_spacer) {
-		buttons_hbox->remove_child(right_spacer);
-		p_button->remove_meta("__right_spacer");
-		right_spacer->queue_free();
+	if (bound_spacer) {
+		buttons_hbox->remove_child(bound_spacer);
+		p_button->remove_meta("__bound_spacer");
+		bound_spacer->queue_free();
 	}
 	buttons_hbox->remove_child(p_button);
 
@@ -486,7 +486,10 @@ AcceptDialog::AcceptDialog() {
 	ok_button = memnew(Button);
 	set_default_ok_text(ETR("OK"));
 	buttons_hbox->add_child(ok_button);
-	buttons_hbox->add_spacer();
+	// Ensure hiding OK button will hide one of the initial spacers.
+	Control *bound_spacer = buttons_hbox->add_spacer();
+	ok_button->set_meta("__bound_spacer", bound_spacer);
+	ok_button->connect(SceneStringName(visibility_changed), callable_mp(this, &AcceptDialog::_button_visibility_changed).bind(ok_button));
 
 	ok_button->connect(SceneStringName(pressed), callable_mp(this, &AcceptDialog::_ok_pressed));
 

scene/gui/dialogs.h

@@ -65,7 +65,7 @@ class AcceptDialog : public Window {
 	} theme_cache;
 
 	void _custom_action(const String &p_action);
-	void _custom_button_visibility_changed(Button *button);
+	void _button_visibility_changed(Button *button);
 	void _update_child_rects();
 	void _update_ok_text();