It seems that the GFF format works wrong if there is no header in the file:
the first line is just skipped in that case.
- Open _common_data/gff/noheader.gff
- Connect it with some sequence to observe annotations
- Open the file in some text editor
Current state: the first line of the file contains 'chromosome' annotation and it is absent in UGENE
Test ignored: GUITest_regression_scenarios_test_1325 (the result of opening the file from that test is incorrect)