Chroma view provides gaps in sequences

If you use symbols editing at chroma view you could set gaps ('-') for some symbols. So a sequence at the sequence view binded with this chromatogram could become incorrect.

For example:
1. Open a file "test/_common_data/abif/47_042.ab1". Cromatogram view is opened. The sequence is "NNNNN" (5 symbols)
(There is one sequence above the cromatogram. And another sequence is under the cromatogram)

2. Call a context menu of the view and choose "Edit new sequnce" and click "Create" at the appeared dialog.
(Sequence view is opened. On the croma view: there are two sequences above the cromatogram now, but not one)

3. On the croma view: click at the empty place between upper and lower symbols above the cromatogram.
(a menu with symbols appears)

4. Choose gap ('-') on the appeared menu.
Expected state: this symbol on the croma view becomes a gap and the sequence on the sequence view is "NNNN" (4 symbols)

5. Change this symbol another time. For example, choose 'A'.
The symbol becomes 'A'. But the sequence view STILL CONTAINS ONLY 4 SYMBOLS!!!

Try to research how it works in other tools. Maybe, gaps should be removed from chroma view. Or maybe, gaps policy of UGENE should be changed for croma view.