Major Scenario:
1. Open sequence with a size > 2Gb, for example 2GBseq.fa
2. Try to cancel loading process
Expected: Cancel without any errors
Actual:
[ERROR][23:54] Trying to recover from error: Either document must not be null or there must be an error! at C:\BuildAgent\work\release\ugene\src\corelibs\U2Formats\src\TextDocumentFormat.cpp:101