!clear_on_hide

Hi:
clear_on_hide is cleaning readonly texts too, like this:
[text my-field readonly "This text is immovable"]

So, after to clear the input field, the user will see an empty field which cannot be filled.

May be if existed an exception of clear_on_hide like “not_clear_on_hide” or:
[text my-field readonly !clear_on_hide "This text is immovable"]
can be more easy than create a lot of nested groups.

Thanks for this great plugin addon.