This plugin adds a button both to visual and html editor to remove newlines, carriage returns and HTML BR tags from selected text.
When you copy and paste text from another source, e.g. a PDF document or the web you end up having lots of line breaks that will mess up formatting. With this plugin you can remove those unwanted line breaks by selecting the paragraph you want to clean in the text and click the new button "!br" in the editors toolbar. Continue doing this for each paragraph you want to clean.