patch 7.4.1808
Problem: Using wrong feature name to check for 'termguicolors'.
Solution: Use the right feature name. (Ken Takata)
diff --git a/runtime/optwin.vim b/runtime/optwin.vim
index 674d962..7576cec 100644
--- a/runtime/optwin.vim
+++ b/runtime/optwin.vim
@@ -412,7 +412,7 @@
call <SID>OptionG("hl", &hl)
call append("$", "hlsearch\thighlight all matches for the last used search pattern")
call <SID>BinOptionG("hls", &hls)
-if has("termtruecolor")
+if has("termguicolors")
call append("$", "termguicolors\tuse GUI colors for the terminal")
call <SID>BinOptionG("tgc", &gcol)
endif