From a3a57181a6de8878e392a82435f03c3f18f48755 Mon Sep 17 00:00:00 2001
From: itsmattkc <itsmattkc@gmail.com>
Date: Thu, 29 Oct 2020 02:59:10 +1100
Subject: [PATCH] re-copy list when waiting since it may have changed

---
 app/render/previewautocacher.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/app/render/previewautocacher.cpp b/app/render/previewautocacher.cpp
index 030c94e48..66973aa7c 100644
--- a/app/render/previewautocacher.cpp
+++ b/app/render/previewautocacher.cpp
@@ -327,6 +327,7 @@ void PreviewAutoCacher::ClearHashQueue(bool wait)
     (*it)->cancel();
   }
   if (wait) {
+    copy = hash_tasks_;
     for (auto it=copy.cbegin(); it!=copy.cend(); it++) {
       (*it)->waitForFinished();
     }
@@ -342,6 +343,7 @@ void PreviewAutoCacher::ClearVideoQueue(bool wait)
     it.key()->Cancel();
   }
   if (wait) {
+    copy = video_tasks_;
     for (auto it=copy.cbegin(); it!=copy.cend(); it++) {
       it.key()->WaitForFinished();
     }
@@ -360,6 +362,7 @@ void PreviewAutoCacher::ClearAudioQueue(bool wait)
     it.key()->Cancel();
   }
   if (wait) {
+    copy = audio_tasks_;
     for (auto it=copy.cbegin(); it!=copy.cend(); it++) {
       it.key()->WaitForFinished();
     }
@@ -375,6 +378,7 @@ void PreviewAutoCacher::ClearVideoDownloadQueue(bool wait)
     it.key()->cancel();
   }
   if (wait) {
+    copy = video_download_tasks_;
     for (auto it=copy.cbegin(); it!=copy.cend(); it++) {
       it.key()->waitForFinished();
     }