This question was asked 6 years ago. I am having a similar issue myself with a form I have and I am trying to edit so that it will allow users the ability to print what is in the scrollable text field. The text field in my case is limited to 5,000 characters at font 11 and I want it to scroll and I want it to stay at the same font, so the issue is making it print. I know it can be done, I have another form that does exactly what I am wanting in my form. It requires scripting, which I don't know much about. This is part of the scripting that enables the form to print what is hidden:
<event activity="prePrint" ref="$host" name="event__prePrint">
<event activity="postPrint" ref="$host" name="event__postPrint">
Perhaps there is more to it above and below this code, but I don't know what that would be, I just know this part of the code is a big part of the script. Anyway, I thought I would share this bit of info in case some genius can use it to help others, I know it is not much and the question is 6 yrs old.