From 69e7afee268d1cb62607eca68212207a6ac8f38a Mon Sep 17 00:00:00 2001
From: Andreas <andens@users.noreply.github.com>
Date: Wed, 7 Mar 2018 13:44:55 +0100
Subject: [PATCH] fix dev tools window interfering with mouse forward (#12132)

---
 atom/browser/native_window_views_win.cc | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/atom/browser/native_window_views_win.cc b/atom/browser/native_window_views_win.cc
index 83e7dfaa79a..746a9978b8f 100644
--- a/atom/browser/native_window_views_win.cc
+++ b/atom/browser/native_window_views_win.cc
@@ -160,8 +160,12 @@ bool NativeWindowViews::PreHandleMSG(
       if (LOWORD(w_param) == WM_CREATE) {
         // Because of reasons regarding legacy drivers and stuff, a window that
         // matches the client area is created and used internally by Chromium.
-        // This is used when forwarding mouse messages.
-        legacy_window_ = reinterpret_cast<HWND>(l_param);
+        // This is used when forwarding mouse messages. We only cache the first
+        // occurrence (the webview window) because dev tools also cause this
+        // message to be sent.
+        if (!legacy_window_) {
+          legacy_window_ = reinterpret_cast<HWND>(l_param);
+        }
       }
       return false;
     }