Fix for issue #2080 where the GUI appears to hang when a chat with a large

model is deleted. There is no reason to save the context for a chat that
is being deleted.

Signed-off-by: Adam Treat <treat.adam@gmail.com>

gpt4all-chat/chatllm.cpp

@@ -64,6 +64,7 @@ ChatLLM::ChatLLM(Chat *parent, bool isServer)
     , m_isRecalc(false)
     , m_shouldBeLoaded(false)
     , m_forceUnloadModel(false)
+    , m_markedForDeletion(false)
     , m_shouldTrySwitchContext(false)
     , m_stopGenerating(false)
     , m_timer(nullptr)
@@ -690,7 +691,9 @@ void ChatLLM::unloadModel()
     else
         emit modelLoadingPercentageChanged(std::numeric_limits<float>::min()); // small non-zero positive value
 
-    saveState();
+    if (!m_markedForDeletion)
+        saveState();
+
 #if defined(DEBUG_MODEL_LOADING)
     qDebug() << "unloadModel" << m_llmThread.objectName() << m_llModelInfo.model;
 #endif