From ba208df6e6629727f8702b85a5c025875cb41adb Mon Sep 17 00:00:00 2001
From: Markus Sauermann <6299227+Sauermann@users.noreply.github.com>
Date: Sun, 27 Mar 2022 01:26:49 +0100
Subject: [PATCH] Send a focus-out notification when opening a Window Manager
 Popup

---
 scene/main/window.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/scene/main/window.cpp b/scene/main/window.cpp
index 6837fcae213..62e8e7fea7d 100644
--- a/scene/main/window.cpp
+++ b/scene/main/window.cpp
@@ -1101,6 +1101,14 @@ void Window::popup_centered_ratio(float p_ratio) {
 void Window::popup(const Rect2i &p_screen_rect) {
 	emit_signal(SNAME("about_to_popup"));
 
+	if (!_get_embedder() && get_flag(FLAG_POPUP)) {
+		// Send a focus-out notification when opening a Window Manager Popup.
+		SceneTree *scene_tree = get_tree();
+		if (scene_tree) {
+			scene_tree->notify_group("_viewports", NOTIFICATION_WM_WINDOW_FOCUS_OUT);
+		}
+	}
+
 	// Update window size to calculate the actual window size based on contents minimum size and minimum size.
 	_update_window_size();