patch 8.1.2386: 'wincolor' is not used for 'listchars'

Problem:    'wincolor' is not used for 'listchars'.
Solution:   Combine the colors. (closes #5308)
diff --git a/src/testdir/dumps/Test_wincolor_lcs.dump b/src/testdir/dumps/Test_wincolor_lcs.dump
new file mode 100644
index 0000000..1e146b2
--- /dev/null
+++ b/src/testdir/dumps/Test_wincolor_lcs.dump
@@ -0,0 +1,8 @@
+|<+0#4040ff13#ffff4012| +0#0000001&@73
+|-+0#0000e05&@2|>|-@6>s+0#0000001&|o|m|e|.+0#0000e05&|r+0#0000001&|a|n|d|o|m|.+0#0000e05&|*+0#e0e0e08#6c6c6c255|.+0#0000e05#ffff4012|e+0#0000001&|n|o|u|g|h|.+0#0000e05&|l+0#0000001&|o|n|g|.+0#0000e05&|t+0#0000001&|o|.+0#0000e05&|s+0#0000001&|h|o|w|.+0#0000e05&|'+0#0000001&|e|x|t|e|n|d|s|'|.+0#0000e05&|a+0#0000001&|n|d|.+0#0000e05&|'+0#0000001&|p|r|e|c|e|d|e|s|'|.+0#0000e05&|i+0#0000001&|n|c|l|>+0#4040ff13&
+|<| +0#0000001&@73
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000#ffffff0@56|2|,|3|-|1|7| @7|A|l@1| 
diff --git a/src/testdir/test_highlight.vim b/src/testdir/test_highlight.vim
index c6aa3a2..f63abee 100644
--- a/src/testdir/test_highlight.vim
+++ b/src/testdir/test_highlight.vim
@@ -620,6 +620,28 @@
   call delete('Xtest_wincolor')
 endfunc
 
+func Test_wincolor_listchars()
+  CheckScreendump
+
+  let lines =<< trim END
+	call setline(1, ["one","\t\tsome random text enough long to show 'extends' and 'precedes' includingnbsps, preceding tabs and trailing spaces    ","three"])
+	set wincolor=Todo
+	set nowrap cole=1 cocu+=n
+	set list lcs=eol:$,tab:>-,space:.,trail:_,extends:>,precedes:<,conceal:*,nbsp:#
+	call matchadd('Conceal', 'text')
+	normal 2G5zl
+  END
+  call writefile(lines, 'Xtest_wincolorlcs')
+  let buf = RunVimInTerminal('-S Xtest_wincolorlcs', {'rows': 8})
+
+  call VerifyScreenDump(buf, 'Test_wincolor_lcs', {})
+
+  " clean up
+  call term_sendkeys(buf, "\<Esc>")
+  call StopVimInTerminal(buf)
+  call delete('Xtest_wincolorlcs')
+endfunc
+
 func Test_colorcolumn()
   CheckScreendump