Why is it bad to commit lines with trailing whitespace into source control?

Question

Why is it bad to check in lines with trailing whitespace to your source control? What kinds of problems could that cause?

Answer 1

Because many people remove them you will have them show up as modified lines in diff tools if you don't use all the options (say a plain old cvs diff) which means people see your line for no good reason.

In theory you could also have strings that wrap lines where whitespace would truly be bad, but... probably not your issue.