Answered
When text is copied from the PDF, it contains unwanted line breaks, especially if it has been copied from a PDF with columns.
It would be great to be able to paste copied text into comment boxes without these line breaks.
An option to "Paste Without Formatting", with a keyboard shortcut (Ctrl-Shift-V) in Reader could be configured to solve this problem, assuming that formatting also means line breaks.
https://www.adobe.com/cfusion/mmform/index.cfm?name=wishform
One trick that might work for you is changing this setting:
1. Go to Edit > Preferences, click Commenting at the top.
2. Check the box - Copy selected text into Highlight, Cross-Out, and Underline comment pop-ups.
Now, when you highlight something in the PDF, that text is automatically added to the note, with no extra line breaks.
Kelly McCathran
Adobe Community Expert
Certified Technical Trainer+