From c46194d08b80efd99faf330d15b347718b355f03 Mon Sep 17 00:00:00 2001
From: ed <eddavies95@gmail.com>
Date: Fri, 6 Dec 2019 16:57:09 +0000
Subject: [PATCH] Windows:  Fixed a deadlock that could occur when dispatching
 messages from the overflow queue

---
 .../juce_events/native/juce_win32_Messaging.cpp | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/modules/juce_events/native/juce_win32_Messaging.cpp b/modules/juce_events/native/juce_win32_Messaging.cpp
index 43c9152069..14349090d5 100644
--- a/modules/juce_events/native/juce_win32_Messaging.cpp
+++ b/modules/juce_events/native/juce_win32_Messaging.cpp
@@ -230,16 +230,23 @@ private:
 
     void dispatchOverflowMessages()
     {
-        const ScopedLock sl (lock);
+        ReferenceCountedArray<MessageManager::MessageBase> messagesToDispatch;
 
-        for (int i = 0; i < overflowQueue.size(); ++i)
         {
-            auto message = overflowQueue.getUnchecked (i);
+            const ScopedLock sl (lock);
+
+            if (overflowQueue.isEmpty())
+                return;
+
+            messagesToDispatch.swapWith (overflowQueue);
+        }
+
+        for (int i = 0; i < messagesToDispatch.size(); ++i)
+        {
+            auto message = messagesToDispatch.getUnchecked (i);
             message->incReferenceCount();
             dispatchMessageFromLParam ((LPARAM) message.get());
         }
-
-        overflowQueue.clear();
     }
 
     //==============================================================================