From 9a05ea231a41ebb6c53540532b1094057cd9487e Mon Sep 17 00:00:00 2001
From: Rindbee <idleman@yeah.net>
Date: Tue, 4 Oct 2022 10:12:11 +0800
Subject: [PATCH] Make sure to reset the tooltip of its gui_parent when the
 viewport is removed

---
 scene/main/viewport.cpp | 12 ++++++++----
 scene/main/viewport.h   |  1 +
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 05b4f181c2e..0795d91035a 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -499,6 +499,13 @@ void Viewport::_notification(int p_what) {
 			// exit event if the change in focus results in the mouse exiting
 			// the window.
 		} break;
+
+		case NOTIFICATION_PREDELETE: {
+			if (gui_parent) {
+				gui_parent->gui.tooltip_popup = nullptr;
+				gui_parent->gui.tooltip_label = nullptr;
+			}
+		} break;
 	}
 }
 
@@ -1155,8 +1162,6 @@ void Viewport::_gui_cancel_tooltip() {
 	}
 	if (gui.tooltip_popup) {
 		gui.tooltip_popup->queue_delete();
-		gui.tooltip_popup = nullptr;
-		gui.tooltip_label = nullptr;
 	}
 }
 
@@ -1219,8 +1224,6 @@ void Viewport::_gui_show_tooltip() {
 	// Remove previous popup if we change something.
 	if (gui.tooltip_popup) {
 		memdelete(gui.tooltip_popup);
-		gui.tooltip_popup = nullptr;
-		gui.tooltip_label = nullptr;
 	}
 
 	if (!tooltip_owner) {
@@ -1252,6 +1255,7 @@ void Viewport::_gui_show_tooltip() {
 	panel->set_flag(Window::FLAG_POPUP, false);
 	panel->set_wrap_controls(true);
 	panel->add_child(base_tooltip);
+	panel->gui_parent = this;
 
 	gui.tooltip_popup = panel;
 
diff --git a/scene/main/viewport.h b/scene/main/viewport.h
index 471dc412466..6f67649ea37 100644
--- a/scene/main/viewport.h
+++ b/scene/main/viewport.h
@@ -208,6 +208,7 @@ private:
 	friend class ViewportTexture;
 
 	Viewport *parent = nullptr;
+	Viewport *gui_parent = nullptr; // Whose gui.tooltip_popup it is.
 
 	AudioListener2D *audio_listener_2d = nullptr;
 	Camera2D *camera_2d = nullptr;