From c66dfd2cfe8f2bb11b1ac5b237b9aba63fdd069f Mon Sep 17 00:00:00 2001
From: kleonc <9283098+kleonc@users.noreply.github.com>
Date: Thu, 14 Sep 2023 23:37:28 +0200
Subject: [PATCH] Enable transparent background for GUI tooltips

---
 scene/main/viewport.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 5f8f5225c91..1da6f203350 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -1489,6 +1489,9 @@ void Viewport::_gui_show_tooltip() {
 	PopupPanel *panel = memnew(PopupPanel);
 	panel->set_theme_type_variation(SNAME("TooltipPanel"));
 
+	// Ensure no opaque background behind the panel as its StyleBox can be partially transparent (e.g. corners).
+	panel->set_transparent_background(true);
+
 	// Controls can implement `make_custom_tooltip` to provide their own tooltip.
 	// This should be a Control node which will be added as child to a TooltipPanel.
 	Control *base_tooltip = tooltip_owner->make_custom_tooltip(tooltip_text);