Sequence Writer provides choosing GFF format, but it is not implemented now. So, UGENE crashes on assert(0).
Implement writing of GFF files.
Currently there is a hardcoded solution in the "CoreLib.cpp" file (at branch):
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// temporary excluding GFF format (UGENE-747)
{
supportedFormats.removeOne(BaseDocumentFormats::GFF);
}
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Remove it after implementing this issue.