Cleanup.

src/internal/ui/text_mode/text_mode.cc

@@ -2,6 +2,8 @@
 #include "bed.h"
 
 namespace bed::internal::ui::text_mode {
+// TODO: make this into a proper layout engine, in order to avoid so many expensive calculations repeatedly.
+
 template <typename F>
 static void for_each_cluster(std::string_view s, F &&f) {
   size_t cluster_start = 0;