Prevent Popups it the edited scene tree from closing on focus loss. Hide irrelevant Popup flags from the editor inspector.

scene/gui/popup.cpp

@@ -77,6 +77,7 @@ void Popup::_update_theme_item_cache() {
 void Popup::_notification(int p_what) {
 	switch (p_what) {
 		case NOTIFICATION_VISIBILITY_CHANGED: {
+			if (!is_in_edited_scene_root()) {
 				if (is_visible()) {
 					_initialize_visible_parents();
 				} else {
@@ -84,21 +85,28 @@ void Popup::_notification(int p_what) {
 					emit_signal(SNAME("popup_hide"));
 					popped_up = false;
 				}
+			}
 		} break;
 
 		case NOTIFICATION_WM_WINDOW_FOCUS_IN: {
+			if (!is_in_edited_scene_root()) {
 				if (has_focus()) {
 					popped_up = true;
 				}
+			}
 		} break;
 
 		case NOTIFICATION_EXIT_TREE: {
+			if (!is_in_edited_scene_root()) {
 				_deinitialize_visible_parents();
+			}
 		} break;
 
 		case NOTIFICATION_WM_CLOSE_REQUEST:
 		case NOTIFICATION_APPLICATION_FOCUS_OUT: {
+			if (!is_in_edited_scene_root()) {
 				_close_pressed();
+			}
 		} break;
 	}
 }
@@ -126,6 +134,16 @@ void Popup::_bind_methods() {
 	ADD_SIGNAL(MethodInfo("popup_hide"));
 }
 
+void Popup::_validate_property(PropertyInfo &p_property) const {
+	if (
+			p_property.name == "transient" ||
+			p_property.name == "exclusive" ||
+			p_property.name == "popup_window" ||
+			p_property.name == "unfocusable") {
+		p_property.usage = PROPERTY_USAGE_NO_EDITOR;
+	}
+}
+
 Rect2i Popup::_popup_adjust_rect() const {
 	ERR_FAIL_COND_V(!is_inside_tree(), Rect2());
 	Rect2i parent_rect = get_usable_parent_rect();

scene/gui/popup.h

@@ -59,6 +59,7 @@ protected:
 	virtual void _update_theme_item_cache() override;
 	void _notification(int p_what);
 	static void _bind_methods();
+	void _validate_property(PropertyInfo &p_property) const;
 
 	virtual void _parent_focused();
 

scene/main/window.cpp

@@ -157,26 +157,18 @@ void Window::set_flag(Flags p_flag, bool p_enabled) {
 		embedder->_sub_window_update(this);
 
 	} else if (window_id != DisplayServer::INVALID_WINDOW_ID) {
-#ifdef TOOLS_ENABLED
+		if (!is_in_edited_scene_root()) {
-		if ((p_flag != FLAG_POPUP) || !(Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && (get_tree()->get_edited_scene_root()->is_ancestor_of(this) || get_tree()->get_edited_scene_root() == this))) {
 			DisplayServer::get_singleton()->window_set_flag(DisplayServer::WindowFlags(p_flag), p_enabled, window_id);
 		}
-#else
-		DisplayServer::get_singleton()->window_set_flag(DisplayServer::WindowFlags(p_flag), p_enabled, window_id);
-#endif
 	}
 }
 
 bool Window::get_flag(Flags p_flag) const {
 	ERR_FAIL_INDEX_V(p_flag, FLAG_MAX, false);
 	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
-#ifdef TOOLS_ENABLED
+		if (!is_in_edited_scene_root()) {
-		if ((p_flag != FLAG_POPUP) || !(Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && (get_tree()->get_edited_scene_root()->is_ancestor_of(this) || get_tree()->get_edited_scene_root() == this))) {
 			flags[p_flag] = DisplayServer::get_singleton()->window_get_flag(DisplayServer::WindowFlags(p_flag), window_id);
 		}
-#else
-		flags[p_flag] = DisplayServer::get_singleton()->window_get_flag(DisplayServer::WindowFlags(p_flag), window_id);
-#endif
 	}
 	return flags[p_flag];
 }
@@ -232,6 +224,14 @@ bool Window::is_embedded() const {
 	return _get_embedder() != nullptr;
 }
 
+bool Window::is_in_edited_scene_root() const {
+#ifdef TOOLS_ENABLED
+	return (Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && (get_tree()->get_edited_scene_root()->is_ancestor_of(this) || get_tree()->get_edited_scene_root() == this));
+#else
+	return false;
+#endif
+}
+
 void Window::_make_window() {
 	ERR_FAIL_COND(window_id != DisplayServer::INVALID_WINDOW_ID);
 
@@ -259,15 +259,12 @@ void Window::_make_window() {
 #endif
 	DisplayServer::get_singleton()->window_set_title(tr_title, window_id);
 	DisplayServer::get_singleton()->window_attach_instance_id(get_instance_id(), window_id);
-#ifdef TOOLS_ENABLED
+
-	if (!(Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && (get_tree()->get_edited_scene_root()->is_ancestor_of(this) || get_tree()->get_edited_scene_root() == this))) {
+	if (is_in_edited_scene_root()) {
-		DisplayServer::get_singleton()->window_set_exclusive(window_id, exclusive);
-	} else {
 		DisplayServer::get_singleton()->window_set_exclusive(window_id, false);
-	}
+	} else {
-#else
 		DisplayServer::get_singleton()->window_set_exclusive(window_id, exclusive);
-#endif
+	}
 
 	_update_window_size();
 
@@ -465,14 +462,10 @@ void Window::set_visible(bool p_visible) {
 	//update transient exclusive
 	if (transient_parent) {
 		if (exclusive && visible) {
-#ifdef TOOLS_ENABLED
+			if (!is_in_edited_scene_root()) {
-			if (!(Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && (get_tree()->get_edited_scene_root()->is_ancestor_of(this) || get_tree()->get_edited_scene_root() == this))) {
 				ERR_FAIL_COND_MSG(transient_parent->exclusive_child && transient_parent->exclusive_child != this, "Transient parent has another exclusive child.");
 				transient_parent->exclusive_child = this;
 			}
-#else
-			transient_parent->exclusive_child = this;
-#endif
 		} else {
 			if (transient_parent->exclusive_child == this) {
 				transient_parent->exclusive_child = nullptr;
@@ -519,13 +512,9 @@ void Window::_make_transient() {
 		window->transient_children.insert(this);
 		if (is_inside_tree() && is_visible() && exclusive) {
 			if (transient_parent->exclusive_child == nullptr) {
-#ifdef TOOLS_ENABLED
+				if (!is_in_edited_scene_root()) {
-				if (!(Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && (get_tree()->get_edited_scene_root()->is_ancestor_of(this) || get_tree()->get_edited_scene_root() == this))) {
 					transient_parent->exclusive_child = this;
 				}
-#else
-				transient_parent->exclusive_child = this;
-#endif
 			} else if (transient_parent->exclusive_child != this) {
 				ERR_PRINT("Making child transient exclusive, but parent has another exclusive child");
 			}
@@ -568,27 +557,19 @@ void Window::set_exclusive(bool p_exclusive) {
 	exclusive = p_exclusive;
 
 	if (!embedder && window_id != DisplayServer::INVALID_WINDOW_ID) {
-#ifdef TOOLS_ENABLED
+		if (is_in_edited_scene_root()) {
-		if (!(Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && (get_tree()->get_edited_scene_root()->is_ancestor_of(this) || get_tree()->get_edited_scene_root() == this))) {
-			DisplayServer::get_singleton()->window_set_exclusive(window_id, exclusive);
-		} else {
 			DisplayServer::get_singleton()->window_set_exclusive(window_id, false);
-		}
+		} else {
-#else
 			DisplayServer::get_singleton()->window_set_exclusive(window_id, exclusive);
-#endif
+		}
 	}
 
 	if (transient_parent) {
 		if (p_exclusive && is_inside_tree() && is_visible()) {
 			ERR_FAIL_COND_MSG(transient_parent->exclusive_child && transient_parent->exclusive_child != this, "Transient parent has another exclusive child.");
-#ifdef TOOLS_ENABLED
+			if (!is_in_edited_scene_root()) {
-			if (!(Engine::get_singleton()->is_editor_hint() && get_tree()->get_edited_scene_root() && (get_tree()->get_edited_scene_root()->is_ancestor_of(this) || get_tree()->get_edited_scene_root() == this))) {
 				transient_parent->exclusive_child = this;
 			}
-#else
-			transient_parent->exclusive_child = this;
-#endif
 		} else {
 			if (transient_parent->exclusive_child == this) {
 				transient_parent->exclusive_child = nullptr;

scene/main/window.h

@@ -234,6 +234,8 @@ public:
 	void set_clamp_to_embedder(bool p_enable);
 	bool is_clamped_to_embedder() const;
 
+	bool is_in_edited_scene_root() const;
+
 	bool can_draw() const;
 
 	void set_ime_active(bool p_active);