DolphinQt: Fix the panic alert deadlock, Pause on Focus Loss edition

why are there so many ways to trigger this issue

1 files changed, 7 insertions, 1 deletions

diff --git a/Source/Core/DolphinQt/RenderWidget.cpp b/Source/Core/DolphinQt/RenderWidget.cpp
index 234eb270cb..e784956e27 100644
--- a/Source/Core/DolphinQt/RenderWidget.cpp
+++ b/Source/Core/DolphinQt/RenderWidget.cpp
@@ -203,7 +203,13 @@ bool RenderWidget::event(QEvent* event)
     break;
   case QEvent::WindowDeactivate:
     if (SConfig::GetInstance().m_PauseOnFocusLost && Core::GetState() == Core::State::Running)
-      Core::SetState(Core::State::Paused);
+    {
+      // If we are declared as the CPU thread, it means that the real CPU thread is waiting
+      // for us to finish showing a panic alert (with that panic alert likely being the cause
+      // of this event), so trying to pause the real CPU thread would cause a deadlock
+      if (!Core::IsCPUThread())
+        Core::SetState(Core::State::Paused);
+    }
 
     emit FocusChanged(false);
     break;