Add missing color specifications

[vantaboard]

Some color specifications were missing which introduced terminal scheme weirdness when exporting with

:call append('$', printf('export FZF_DEFAULT_OPTS="%s"', matchstr(fzf#wrap().options, "--color[^']*")))

Before and after with junegunn/seoul256.vim (dark):

Before and after with junegunn/seoul256.vim (light):

The following changes resolve this:

commit e4eb64f82a88888729c0624bf5790cd29bea86b2
Author: Brighten Tompkins <[email protected]>
Date:   Wed Nov 29 08:47:14 2023 -0800

    [advanced-docs] add missing color specs

diff --git a/ADVANCED.md b/ADVANCED.md
index 661bac1..00311fb 100644
--- a/ADVANCED.md
+++ b/ADVANCED.md
@@ -583,6 +583,7 @@ Here is an example. Add this to your Vim configuration file.
 let g:fzf_colors =
 \ { 'fg':         ['fg', 'Normal'],
   \ 'bg':         ['bg', 'Normal'],
+  \ 'preview-fg': ['bg', 'Normal'],
   \ 'preview-bg': ['bg', 'NormalFloat'],
   \ 'hl':         ['fg', 'Comment'],
   \ 'fg+':        ['fg', 'CursorLine', 'CursorColumn', 'Normal'],
@@ -594,6 +595,9 @@ let g:fzf_colors =
   \ 'pointer':    ['fg', 'Exception'],
   \ 'marker':     ['fg', 'Keyword'],
   \ 'spinner':    ['fg', 'Label'],
+  \ 'gutter':     ['bg', 'SignColumn'],
+  \ 'query':      ['fg', 'Comment'],
+  \ 'disabled':   ['fg', 'Ignore'],
   \ 'header':     ['fg', 'Comment'] }

Additionally, I added an example for Lua configurations and updated the FZF_DEFAULT_OPTS variable for junegunn/seoul256.vim, morhetz/gruvbox, arcticicestudio/nord-vim, and tomasr/molokai.

[junegunn]

The colors doesn't look right.

Before:

After:

[vantaboard]

Which theme were you trying?

[junegunn]

preview-fg defaults to fg, so this line shouldn't be necessary. And the first argument bg doesn't seem correct.