tdf#129300 If it would create no change, don't force it

otherwise a bogus "change" from the parent style is shown in the organizer

this dates to...

commit 755ad6834625488c5d31d4bacc9370eae7ffd8f3
Date:   Tue Oct 5 11:15:56 2010 -0400

    Ported calc-distributed-cell-text-*.diff from ooo-build.

Change-Id: I49fc654a232d3c0f43f8add9a9f9fee34a6c5add
Reviewed-on: https://gerrit.libreoffice.org/84895
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/cui/source/tabpages/align.cxx b/cui/source/tabpages/align.cxx
index e79a396..cdd87f0 100644
--- a/cui/source/tabpages/align.cxx
+++ b/cui/source/tabpages/align.cxx
@@ -90,6 +90,11 @@ void lcl_SetJustifyMethodToItemSet(SfxItemSet& rSet, sal_uInt16 nWhichJM, const 
    if (rLB.get_active() == nListPos)
        eJM = SvxCellJustifyMethod::Distribute;

    // tdf#129300 If it would create no change, don't force it
    const SvxJustifyMethodItem& rOldItem = static_cast<const SvxJustifyMethodItem&>(rSet.Get(nWhichJM));
    if (rOldItem.GetValue() == eJM)
        return;

    SvxJustifyMethodItem aItem(eJM, nWhichJM);
    rSet.Put(aItem);
}