console.lua: highlight the select menu's preselected item

Requested in
mpv-player#14087 (comment) and
mpv-player#15031 (comment)

This is mainly useful to keep highlighting the current playlist entry
after moving the mouse.

player/lua/console.lua

@@ -74,6 +74,7 @@ local terminal_styles = {
     error = '\027[31m',
     fatal = '\027[91m',
     selected_suggestion = '\027[7m',
+    default_item = '\027[1m',
     disabled = '\027[38;5;8m',
 }
 
@@ -108,6 +109,7 @@ local completion_old_cursor
 local selectable_items
 local matches = {}
 local selected_match = 1
+local default_match
 local first_match_to_print = 1
 
 local set_active
@@ -453,11 +455,23 @@ local function populate_log_with_matches(max_width)
     end
 
     for i = first_match_to_print, last_match_to_print do
+        local style = ''
+        local terminal_style = ''
+
+        if i == selected_match then
+            style = styles.selected_suggestion
+            terminal_style = terminal_styles.selected_suggestion
+        end
+        if i == default_match then
+            style = style .. styles.warn
+            terminal_style = terminal_style .. terminal_styles.default_item
+        end
+
         log[#log + 1] = {
             text = (max_width and truncate_utf8(matches[i].text, max_width)
                     or matches[i].text),
-            style = i == selected_match and styles.selected_suggestion or '',
-            terminal_style = i == selected_match and terminal_styles.selected_suggestion or '',
+            style = style,
+            terminal_style = terminal_style,
         }
     end
 
@@ -1805,6 +1819,7 @@ mp.register_script_message('get-input', function (script_name, args)
     if selectable_items then
         matches = {}
         selected_match = args.default_item or 1
+        default_match = args.default_item
         first_match_to_print = 1
         for i, item in ipairs(selectable_items) do
             matches[i] = { index = i, text = item }