Describe the bug
Degate seems to be unable to handle large images in the latest version with the 'attached' project type.

To Reproduce
Steps to reproduce the behavior:

1. Create a JPEG of 53675x24205 pixels
2. Create a new 'attached' project
3. Use that JPEG as one of the layers
4. Zoom in on the image several times (I counted about 21 click on the + button), at some point the program hangs and crashes

I also tested the half-sized image with the same result.

Expected behavior
There should be no crashing.

Desktop (please complete the following information):

• OS: Windows
• Version: 2.1.0-1