From 84ae4e58806b04d51d864477b10f0ce02e490df8 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Sat, 12 Jan 2019 16:41:03 +0100
Subject: [PATCH] WindowManager should only flush pixels inside the screen
 rect.

---
 Widgets/WindowManager.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Widgets/WindowManager.cpp b/Widgets/WindowManager.cpp
index a45f3483f2..ceb863e174 100644
--- a/Widgets/WindowManager.cpp
+++ b/Widgets/WindowManager.cpp
@@ -351,9 +351,10 @@ void WindowManager::invalidate(const Window& window)
     invalidate(outerRectForWindow(window.rect()));
 }
 
-void WindowManager::flush(const Rect& rect)
+void WindowManager::flush(const Rect& a_rect)
 {
     auto& framebuffer = FrameBuffer::the();
+    auto rect = Rect::intersection(a_rect, framebuffer.rect());
 
     for (int y = rect.top(); y <= rect.bottom(); ++y) {
         auto* front_scanline = m_front_bitmap->scanline(y);