this existed, at least for diffs of C#, as semanticmerge (bundled with GMaster and PlasticSCM), from Codice Software, a Spanish company. since it got bought by

this existed, at least for diffs of C#, as semanticmerge (bundled with GMaster and PlasticSCM), from Codice Software, a Spanish company. since it got bought by Unity, they've discontinued it... so my license of it evaporated. I've missed it a lot, having to diff with kdiff3