Handle mouse events in key_to_str

src/keys.cc

@@ -100,6 +100,9 @@ KeyList parse_keys(StringView str)
 
 String key_to_str(Key key)
 {
+    if (key.modifiers & Key::Modifiers::MouseEvent)
+        return "<mouse event>";
+
     bool named = false;
     String res;
     auto it = find_if(keynamemap, [&key](const KeyAndName& item)

src/keys.hh

@@ -24,6 +24,8 @@ struct Key
         MousePos     = 1 << 4,
         MouseWheelDown = 1 << 5,
         MouseWheelUp = 1 << 6,
+        MouseEvent = MousePress | MouseRelease | MousePos |
+                     MouseWheelDown | MouseWheelUp,
     };
     enum NamedKey : Codepoint
     {