Printing lines of full width produces extra blank line

[judah]

Listing completion alternatives can print extra blank lines if each line takes up the full width. This happens on Windows and probably also on terminals without the newline glitch.

Possible solutions:

• Make the paging command ensure that it leaves one blank column
• Have the printLines instances check whether the line they're printing is exactly 80 charaters, and if so don't print a newline.