From 67ca4997e22cd88e349ecffd2cd388431dcc8de3 Mon Sep 17 00:00:00 2001
From: Nadia Holmquist Pedersen <nadia@nhp.sh>
Date: Sun, 25 Feb 2024 14:25:50 +0100
Subject: [PATCH] Release all keyboard keys on focus loss (fixes #1987)

---
 src/frontend/qt_sdl/Input.cpp  | 5 +++++
 src/frontend/qt_sdl/Input.h    | 1 +
 src/frontend/qt_sdl/Window.cpp | 1 +
 3 files changed, 7 insertions(+)

diff --git a/src/frontend/qt_sdl/Input.cpp b/src/frontend/qt_sdl/Input.cpp
index c429cd36..27c42e9a 100644
--- a/src/frontend/qt_sdl/Input.cpp
+++ b/src/frontend/qt_sdl/Input.cpp
@@ -128,6 +128,11 @@ void KeyRelease(QKeyEvent* event)
             KeyHotkeyMask &= ~(1<<i);
 }
 
+void KeyReleaseAll()
+{
+    KeyInputMask = 0xFFF;
+    KeyHotkeyMask = 0;
+}
 
 bool JoystickButtonDown(int val)
 {
diff --git a/src/frontend/qt_sdl/Input.h b/src/frontend/qt_sdl/Input.h
index 2dfa4a77..5a38756b 100644
--- a/src/frontend/qt_sdl/Input.h
+++ b/src/frontend/qt_sdl/Input.h
@@ -40,6 +40,7 @@ void CloseJoystick();
 
 void KeyPress(QKeyEvent* event);
 void KeyRelease(QKeyEvent* event);
+void KeyReleaseAll();
 
 void Process();
 
diff --git a/src/frontend/qt_sdl/Window.cpp b/src/frontend/qt_sdl/Window.cpp
index 0f0b71fd..fde29b69 100644
--- a/src/frontend/qt_sdl/Window.cpp
+++ b/src/frontend/qt_sdl/Window.cpp
@@ -916,6 +916,7 @@ void MainWindow::onAppStateChanged(Qt::ApplicationState state)
 {
     if (state == Qt::ApplicationInactive)
     {
+        Input::KeyReleaseAll();
         if (Config::PauseLostFocus && emuThread->emuIsRunning())
             emuThread->emuPause();
     }