Fix crash on close while detecting devices

ResourceManager.cpp

@@ -106,6 +106,7 @@ void ResourceManager::DetectDevices()
 
 void ResourceManager::DetectDevicesThreadFunction()
 {
+    DetectDeviceMutex.lock();
     unsigned int prev_count = 0;
     float        percent = 0.0f;
 
@@ -175,4 +176,12 @@ void ResourceManager::DetectDevicesThreadFunction()
     }
 
     profile_manager.LoadSizeFromProfile("sizes.ors");
+    
+    DetectDeviceMutex.unlock();
+}
+
+void ResourceManager::WaitForDeviceDetection()
+{
+    DetectDeviceMutex.lock();
+    DetectDeviceMutex.unlock();
 }

ResourceManager.h

@@ -44,6 +44,8 @@ public:
 
     void DetectDevicesThreadFunction();
 
+    void WaitForDeviceDetection();
+
 private:
     static std::unique_ptr<ResourceManager>     instance;
 
@@ -60,6 +62,8 @@ private:
 
     std::thread *                               DetectDevicesThread;
 
+    std::mutex                                  DetectDeviceMutex;
+    
     std::mutex                                  DeviceListChangeMutex;
     std::vector<ResourceManagerCallback>        DeviceListChangeCallbacks;
     std::vector<void *>                         DeviceListChangeCallbackArgs;

qt/OpenRGBDialog2.cpp

@@ -7,6 +7,7 @@
 #include <QLabel>
 #include <QTabBar>
 #include <QMessageBox>
+#include <QCloseEvent>
 
 using namespace Ui;
 
@@ -184,6 +185,12 @@ OpenRGBDialog2::~OpenRGBDialog2()
     delete ui;
 }
 
+void OpenRGBDialog2::closeEvent(QCloseEvent *event)
+{
+    ResourceManager::get()->WaitForDeviceDetection();
+    event->accept();
+}
+
 void OpenRGBDialog2::AddI2CToolsPage()
 {
     /*-----------------------------------------------------*\

qt/OpenRGBDialog2.h

@@ -66,6 +66,7 @@ private:
     void ClearDevicesList();
     void UpdateDevicesList();
     void UpdateProfileList();
+    void closeEvent(QCloseEvent *event);
 
 private slots:
     void on_Exit();