Improvement in the RemovableDriveManager update function:

Don't call the update() if it is already running. Wait for the
other instance to finish instead.

src/slic3r/GUI/RemovableDriveManager.hpp

@@ -102,6 +102,8 @@ private:
 	// sorted ascending by path
 	std::vector<DriveData> 	m_current_drives;
 	mutable tbb::mutex 		m_drives_mutex;
+	// Locking the update() function to avoid that the function is executed multiple times.
+	mutable tbb::mutex 		m_inside_update_mutex;
 
 	// Returns drive path (same as path in DriveData) if exists otherwise empty string.
 	std::string 			get_removable_drive_from_path(const std::string& path);