White space in FO causes PDF TOC problem

I'm using FOP 2.3 with the DITA Open Toolkit. The <title> tags in DITA 
topics are used in the table of contents in a PDF. Each table of 
contents line is justified like this in the PDF:

(left margin)Intro to 
XYZ........................................................14(right margin)
(left margin)Setting Up 
XYZ...................................................18(right margin)

Most lines line up neatly on the right margin, but a few do not go to 
the margin. The cause of a line that does not go all the way to the 
right margin is a <title> tag with white space in it like this:

<title>
   Do This First
</title>

This white space gets copied over to the XSL-FO produced by the DITA OT:

height="150%"><fo:inline end-indent="14pt">
         Do This First
     </fo:inline><fo:inline color="black" 
keep-together.within-line="always" start-indent="-14pt"><fo:leader
color="black" leader-pattern="dots"/><fo:page-number-citation...

And FOP renders this in the PDF like this, where the line does not go 
all the way to the right margin:

(left margin)Do This 
First....................................................10 (right margin)
(left margin)Intro to 
XYZ........................................................14(right margin)
(left margin)Setting Up 
XYZ...................................................18(right margin)

When I remove the whitespace in the XSL-FO, the line renders correctly, 
all the way to the right margin. Both Antenna House and XEP render the 
line correctly, ignoring the extraneous whitespace. This seems like a 
FOP bug, is there a fix for this? Other than removing the whitespace?

Thanks,
Mark