add ranges containers

include/spdlog/details/log_msg.h

@@ -5,6 +5,7 @@
 
 #include <spdlog/common.h>
 #include <string>
+#include <vector>
 
 namespace spdlog {
 namespace details {
@@ -25,6 +26,8 @@ struct SPDLOG_API log_msg
     // wrapping the formatted text with color (updated by pattern_formatter).
     mutable size_t color_range_start{0};
     mutable size_t color_range_end{0};
+    mutable std::vector<size_t>color_ranges_start = {};
+    mutable std::vector<size_t>color_ranges_end   = {};
 
     source_loc source;
     string_view_t payload;