fix(colorscheme): update winhl on colorscheme change

fixes #1696

Author: kyazdani42

lua/nvim-tree.lua

@@ -192,6 +192,7 @@ end
 
 function M.reset_highlight()
   colors.setup()
+  view.reset_winhl()
   renderer.render_hl(view.get_bufnr())
 end
 

lua/nvim-tree/view.lua

@@ -436,6 +436,13 @@ function M.is_root_folder_visible(cwd)
   return cwd ~= "/" and not M.View.hide_root_folder
 end
 
+-- used on ColorScheme event
+function M.reset_winhl()
+  if M.get_winnr() then
+    vim.wo[M.get_winnr()].winhl = M.View.winopts.winhl
+  end
+end
+
 function M.setup(opts)
   local options = opts.view or {}
   M.View.adaptive_size = options.adaptive_size