Fix win-color sink redirection to file

include/spdlog/sinks/wincolor_sink-inl.h

@@ -149,12 +149,12 @@ void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::write_to_file_(const fmt::memory
     DWORD total_written = 0;
     do
     {
-        DWORD bytes_written = 0;
-        bool ok = WriteFile(out_handle_, formatted.data(), size, &bytes_written, nullptr) != 0;
+        DWORD bytes_written = 0;		
+        bool ok = WriteFile(out_handle_, formatted.data()+total_written, size-total_written, &bytes_written, nullptr) != 0;
         if (!ok || bytes_written == 0)
         {
             throw spdlog_ex("wincolor_sink: write_to_file_ failed. GetLastError(): " + std::to_string(::GetLastError()));
-        }
+        }		
         total_written += bytes_written;
     } while (total_written < size);
 }