Kasimier T. Buchcik authored
* xpath.c: Substituted all remaining calls to xmlXPathCmpNodes() for xmlXPathCmpNodesExt(). Tiny further enhancement of xmlXPathCmpNodesExt(). Added additional checks in various code parts to avoid calling sorting or merging functions if the node-set(s) don't need them; i.e., if they are empty or contain just one node.64f7e1a8
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