An amino acid sequence is opened as text

Scenario:

1. Open a nucleotide sequence (e.g "murine.gb").
2. Select the whole sequence.
3. Copy translation.
4. Open the Project View, paste the data.
   Expected state: there is a new document with a sequence object in the Project View. A Sequence View window with an amino acid sequence has been opened.
   Current state: there is a document with a text object in the Project View. A Text View window has been opened.