Qt: Crash fix

src/duckstation-qt/logwindow.cpp

@@ -29,6 +29,9 @@ LogWindow::LogWindow(bool attach_to_main)
 
 LogWindow::~LogWindow()
 {
+  if (g_log_window == this)
+    g_log_window = nullptr;
+
   Log::UnregisterCallback(&LogWindow::logCallback, this);
 }
 
@@ -39,7 +42,7 @@ void LogWindow::updateSettings()
   const bool curr_enabled = (g_log_window != nullptr);
   if (new_enabled == curr_enabled)
   {
-    if (g_log_window->m_attached_to_main_window != attach_to_main)
+    if (g_log_window && g_log_window->m_attached_to_main_window != attach_to_main)
     {
       g_log_window->m_attached_to_main_window = attach_to_main;
       if (attach_to_main)
@@ -288,6 +291,12 @@ void LogWindow::logCallback(void* pUserParam, const char* channelName, const cha
   }
 }
 
+void LogWindow::closeEvent(QCloseEvent* event)
+{
+  // TODO: Update config.
+  QMainWindow::closeEvent(event);
+}
+
 void LogWindow::appendMessage(const QLatin1StringView& channel, quint32 level, const QString& message)
 {
   QTextCursor temp_cursor = m_text->textCursor();

src/duckstation-qt/logwindow.h

@@ -5,9 +5,9 @@
 
 #include "common/log.h"
 
-#include <span>
 #include <QtWidgets/QMainWindow>
 #include <QtWidgets/QPlainTextEdit>
+#include <span>
 
 class LogWindow : public QMainWindow
 {
@@ -34,6 +34,9 @@ private:
   static void logCallback(void* pUserParam, const char* channelName, const char* functionName, LOGLEVEL level,
                           std::string_view message);
 
+protected:
+  void closeEvent(QCloseEvent* event);
+
 private Q_SLOTS:
   void onClearTriggered();
   void onSaveTriggered();