Description
Steps:
1. Open project > Graph tab
2. Press on 'Save As Image' (see 1.png)
3. Save image as 1.png
4. Press on 'Save As Image' again
5. Save image as 1.png (such file already exist)
-> 1.png is saved (overwritten)
-> No warning dialog - IT IS NOT OK
Expected: Warning dialog appears while image saving if a file with the same name already exists