From 20137e45f487ad3a9314e96de2f24e9676184134 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Mon, 25 Mar 2019 13:58:30 +0100
Subject: [PATCH] LibGUI: Ignore GWidget::update() on invisible widgets.

---
 LibGUI/GWidget.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/LibGUI/GWidget.cpp b/LibGUI/GWidget.cpp
index fc5177ebdd..f78ec48ebf 100644
--- a/LibGUI/GWidget.cpp
+++ b/LibGUI/GWidget.cpp
@@ -83,6 +83,7 @@ void GWidget::event(GEvent& event)
 
 void GWidget::handle_paint_event(GPaintEvent& event)
 {
+    ASSERT(is_visible());
     if (fill_with_background_color()) {
         Painter painter(*this);
         painter.fill_rect(event.rect(), background_color());
@@ -227,6 +228,8 @@ void GWidget::update()
 
 void GWidget::update(const Rect& rect)
 {
+    if (!is_visible())
+        return;
     auto* w = window();
     if (!w)
         return;