'termguicolors' #4690

TODO: Only works at startup (i.e., in the user's init.vim/vimrc/--cmd),
      but it should probably work at any time.

---

patch 7.4.1799
Problem:    'guicolors' is a confusing option name.
Solution:   Use 'termguicolors' instead. (Hirohito Higashi)
61be73bb0f

patch 7.4.1806
Problem:    'termguicolors' option missing from the options window.
Solution:   Add the entry.
8e3d1b6326

patch 7.4.1808
Problem:    Using wrong feature name to check for 'termguicolors'.
Solution:   Use the right feature name. (Ken Takata)
8a24b794b8

patch 7.4.1809
Problem:    Using wrong short option name for 'termguicolors'.
Solution:   Use the option name.
868cfc19bb

src/nvim/options.lua

@@ -2382,6 +2382,14 @@ return {
       redraw={'everything'},
       defaults={if_true={vi=""}}
     },
+    {
+      full_name='termguicolors', abbreviation='tgc',
+      type='bool', scope={'global'},
+      vi_def=false,
+      redraw={'everything'},
+      varname='p_tgc',
+      defaults={if_true={vi=false}}
+    },
     {
       full_name='terse',
       type='bool', scope={'global'},