Dot-plots "save image" function is broken

Steps:

1. Use menu

{Tools->Build Dot plot}

.
Expected state: dialog "Build dotplot from sequences" has appear.

2. Fill the next fields in dialog:

{File with first sequence}

dp1.fa

{File with second sequence}

dp2.fa

3. Click Next button
Expected state: dialog "Dotplot" has appear.

4. Fill the next fields in dialog:

{Minimum repeat length}

8bp

{repeats identity}

80%

5. Click OK button
Expected state: Dot plot view has appear. There is 1 line at view.

6. Use context menu on dot plot view

{Dotplot->Save/Load->Save as image}

Expected state: dialog "Save Dotplot image" has appear

7. Browse valid path and save image as png file.
Expected state: saved image identical with dotplot view

Problem: ruler & legend are not saved. see image.png