I'm being so stupid today, it's the subdivisions. The lines that are not matching are in different subdivision so they don't get compared.
Thanks for the hint, this was it. I have noted that the lines are not merged at subdivisions, but not thought to the final end. I think its time to stop programming for today :-/
That's a shame but the upside of only merging within a subdivision is that it's really quick.
Would it be possible to merge lines across more subdivisions or is this a natural limit? Also there seems to be some inaccuracys at rounding, as the line ends do not meet exactly. (Or is this a displaying problem of the QLandkarte?)
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