See testcase attached to Bug #36017. No leaders are generated. The same file produces leaders when processed through xep.
Same possible resolution as for Bug #36014 - the bpd on the generated leader area is not set. If I set the bdp to something, e.g. font.getAscender() proper blank leader areas are generated. No patch as I am not sure what the correct bpd setting for a space filled leader area should be.
This has been fixed as part of revision r307055. See also testcase leader_leader-pattern_space.xml.
batch transition pre-FOP1.0 resolved+fixed bugs to closed+fixed