utility: Fixed message buffer might become empty while applying message filters

src/lib/utility/messaging/MessageQueue.cpp

@@ -216,13 +216,13 @@ void MessageQueue::processMessages()
 		{
 			std::lock_guard<std::mutex> lock(m_messageBufferMutex);
 
-			if (!m_messageBuffer.size())
-			{
-				break;
-			}
-
 			for (std::shared_ptr<MessageFilter> filter : m_filters)
 			{
+				if (!m_messageBuffer.size())
+				{
+					break;
+				}
+
 				filter->filter(&m_messageBuffer);
 			}
 

src/lib/utility/messaging/filter_types/MessageFilterFocusInOut.h

@@ -10,6 +10,11 @@ class MessageFilterFocusInOut
 {
 	void filter(MessageQueue::MessageBufferType* messageBuffer) override
 	{
+		if (messageBuffer->size() < 2)
+		{
+			return;
+		}
+
 		MessageBase* message = messageBuffer->front().get();
 		if (message->getType() == MessageFocusIn::getStaticType())
 		{

src/lib/utility/messaging/filter_types/MessageFilterSearchAutocomplete.h

@@ -9,6 +9,11 @@ class MessageFilterSearchAutocomplete
 {
 	void filter(MessageQueue::MessageBufferType* messageBuffer) override
 	{
+		if (messageBuffer->size() < 2)
+		{
+			return;
+		}
+
 		MessageBase* message = messageBuffer->front().get();
 		if (message->getType() == MessageSearchAutocomplete::getStaticType())
 		{