Created attachment 27336 [details]
FO xml file that has the problem

Using text-align-last="justify" and leader-pattern to align the page number of Table of Contents: 
the alignment of the page is shifted too much/not enough if the document name contains blanks followed by a slash, e.g. "m / / / / / / / / / / / / kk" as document name.
Dependent on how many " /" character pairs are part of the document name, the page number displayed is shifted too much to the right or to the left, the pages are not displayed one underneath the other.
e.g. 
3.3.2. m / / / / / / / / / / / / kk..................................45
3.3.3. m / / / / / / / / / / / / / / / / /kk..........................46

The fo statement used is:
<fo:block space-after="2mm" hyphenate="true" wrap-option="wrap" text-align-last="justify">m / / / / / / / / / / / / kk<fo:leader leader-pattern="dots" /> 45</fo:block>

Please see attached fop renderer input xml and pdf output file as example and for details of the problem.

The problem is dependent on the font, it is with Arial, using MS Gothic is even worse.

We use fop 0.94, but I tried 1.0 too - same result.

The bug could be related to #36238
--> blanks in the document name, but I tried Courier too and it doesn't work either.

#43739 seems to have a similar problem