From 6bc84e00aed175fbc8a2f308b2235db70ae9ba1d Mon Sep 17 00:00:00 2001
From: itsmattkc <34096995+itsmattkc@users.noreply.github.com>
Date: Mon, 6 Jun 2022 20:17:28 -0700
Subject: [PATCH] viewer: add watcher destroyed slot

Prevents crashes
---
 app/widget/viewer/viewer.cpp | 9 +++++++++
 app/widget/viewer/viewer.h   | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/app/widget/viewer/viewer.cpp b/app/widget/viewer/viewer.cpp
index b5726864c..9581454a1 100644
--- a/app/widget/viewer/viewer.cpp
+++ b/app/widget/viewer/viewer.cpp
@@ -530,6 +530,14 @@ void ViewerWidget::CreateAddableAt(const QRectF &f)
   }
 }
 
+void ViewerWidget::HandleFirstRequeueDestroy()
+{
+  // Extra protection to ensure we don't reference a destroyed object
+  if (first_requeue_watcher_ == sender()) {
+    first_requeue_watcher_ = nullptr;
+  }
+}
+
 void ViewerWidget::CloseAudioProcessor()
 {
   audio_processor_.Close();
@@ -676,6 +684,7 @@ void ViewerWidget::ForceRequeueFromCurrentTime()
     RenderTicketWatcher *watcher = RequestNextFrameForQueue();
     if (!first_requeue_watcher_) {
       first_requeue_watcher_ = watcher;
+      connect(first_requeue_watcher_, &RenderTicketWatcher::destroyed, this, &ViewerWidget::HandleFirstRequeueDestroy);
     }
   }
 }
diff --git a/app/widget/viewer/viewer.h b/app/widget/viewer/viewer.h
index 6c58ed194..4a879c367 100644
--- a/app/widget/viewer/viewer.h
+++ b/app/widget/viewer/viewer.h
@@ -338,6 +338,8 @@ private slots:
 
   void CreateAddableAt(const QRectF &f);
 
+  void HandleFirstRequeueDestroy();
+
 };
 
 }