What steps will reproduce the problem?
1. Insert text with paragraphs separated by lines consisting of a single space 
character.
2. Use { and } to skip between paragraphs.

What is the expected output? What do you see instead?

The { and } motions should stop at the whitespace only lines. This is 
consistent with the paragraph text-object which delimits paragraphs with 
whitespace only lines.

What version of the product are you using? On what operating system?

7.4, Linux

Please provide any additional information below.

Wrapping the ml_get() call in startPS() (in search.c) with skipwhite() fixes 
the problem. If we're worried about backward compatibility perhaps a flag could 
be used to turn this behavior on.