bnc#467459 - fix editeng text search with expanded fields.

(cherry picked from commit 274b628a2b523eb45e297352a85f0177c6e747f0)

Signed-off-by: Matúš Kukan <matus.kukan@collabora.com>

Conflicts:
	editeng/source/editeng/editdoc.cxx
	editeng/source/editeng/editdoc.hxx

Change-Id: If59d0e2f886e94148b81cb6cfcad067733fcb918