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fix old off-by-one bug resulting in a coordcache assert
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@10256 a592a061-630c-0410-9148-cb99ea01b6c8
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@ -776,11 +776,11 @@ int MathGridInset::cellYOffset(idx_type idx) const
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bool MathGridInset::idxUpDown(LCursor & cur, bool up) const
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{
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if (up) {
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if (cur.idx() < ncols())
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if (cur.row() == 0)
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return false;
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cur.idx() -= ncols();
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} else {
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if (cur.row() >= nrows())
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if (cur.row() + 1 >= nrows())
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return false;
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cur.idx() += ncols();
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}
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