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GSequence iterators point at the position between two elements so an iterator pointing at the N tree model node is actually between the N-1 and N sequence elements. This means that asking for the previous sequence iterator first and then checking if it is the begin iterator would yeld true for an iterator pointing at the 2nd tree model node and make us return FALSE mistakenly. https://bugzilla.gnome.org/show_bug.cgi?id=679910
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