From ebe8bddc31189258c380d6e9d76601b044af9be2 Mon Sep 17 00:00:00 2001
From: Samuel Attard <sattard@slack-corp.com>
Date: Sun, 19 Jan 2020 22:48:12 -0800
Subject: [PATCH] fix: ignore (un)lock events for sessions that aren't the
 current session (#21805)

---
 .../browser/api/atom_api_power_monitor_win.cc  | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/shell/browser/api/atom_api_power_monitor_win.cc b/shell/browser/api/atom_api_power_monitor_win.cc
index ad85edddc661..15d914bd7eb8 100644
--- a/shell/browser/api/atom_api_power_monitor_win.cc
+++ b/shell/browser/api/atom_api_power_monitor_win.cc
@@ -58,10 +58,20 @@ LRESULT CALLBACK PowerMonitor::WndProc(HWND hwnd,
                                        WPARAM wparam,
                                        LPARAM lparam) {
   if (message == WM_WTSSESSION_CHANGE) {
-    if (wparam == WTS_SESSION_LOCK) {
-      Emit("lock-screen");
-    } else if (wparam == WTS_SESSION_UNLOCK) {
-      Emit("unlock-screen");
+    bool should_treat_as_current_session = true;
+    DWORD current_session_id = 0;
+    if (!::ProcessIdToSessionId(::GetCurrentProcessId(), &current_session_id)) {
+      LOG(ERROR) << "ProcessIdToSessionId failed, assuming current session";
+    } else {
+      should_treat_as_current_session =
+          (static_cast<DWORD>(lparam) == current_session_id);
+    }
+    if (should_treat_as_current_session) {
+      if (wparam == WTS_SESSION_LOCK) {
+        Emit("lock-screen");
+      } else if (wparam == WTS_SESSION_UNLOCK) {
+        Emit("unlock-screen");
+      }
     }
   }
   return ::DefWindowProc(hwnd, message, wparam, lparam);