Improve icon fetching by file extension (#423)

lua/nvim-tree/renderer.lua

@@ -58,11 +58,14 @@ if icon_state.show_file_icon then
   get_file_icon = function(fname, extension, line, depth)
     local icon, hl_group = web_devicons.get_icon(fname, extension)
 
-    if icon then
+    if icon and hl_group ~= "DevIconDefault" then
       if hl_group then
         table.insert(hl, { hl_group, line, depth, depth + #icon + 1 })
       end
       return icon.." "
+    elseif string.match(extension, "%.(.*)") then
+      -- If there are more extensions to the file, try to grab the icon for them recursively
+      return get_file_icon(fname, string.match(extension, "%.(.*)"), line, depth)
     else
       return #icon_state.icons.default > 0 and icon_state.icons.default.." " or ""
     end