"Go to" feature incorrect process sequence length changes in the Sequence View

Scenario to reproduce #1:

1. Open "data/samples/FASTA/human_T1.fa".
2. Call context menu on the sequence view, select {Edit sequence -> Remove subsequence...}

   menu item.

3. Remove region (5000..199950).
4. Enter position 50000 to the "goto" widget on the tool bar, click the "Go" button.
   Expected state: you can't enter this position.
   Current state: you can enter this position, an error message appears in the log after button click (safe point triggers in the debug mode).

Scenario to reproduce #2:

1. Open "data/samples/FASTA/human_T1.fa".
2. Call context menu on the sequence view, select {Edit sequence -> Insert subsequence...} menu item.
   # Insert any subsequence long enough.
   # Enter position 199960 to the "goto" widget on the tool bar, click the "Go" button.
   Expected state: you can enter this position, view shows the position.
   Current state: you can't enter this position.
   
   
   Scenario to reproduce #3:
   # Open "data/samples/FASTA/human_T1.fa".
   # Call context menu on the sequence view, select {Edit sequence -> Insert subsequence...}

   menu item.

3. Insert any subsequence long enough.
4. Call context menu, select {Go to position...}

   menu item.

5. Enter position 199960 and accept the dialog.
   Expected state: view shows the position, there are no errors in the log.
   Current state: view shows the position, there is an error in the log (safe point triggers in the debug mode).