Drag-n-dropping a new image into a brand new document causes it to be imported with significantly higher dimensions than expected

[AndreRoelofs]

Describe the bug

When creating a new document and drag-n-dropping a 768x768 pixels image causes Graphite to import the image as a 1800000x1800000 pixels layer.

To Reproduce

1. Create new document 1920x1080
2. Import a layer

Expected behavior

The newly created layer has the same dimensions as the imported image.

Priority

P0, the issue makes working with Graphite impossible.
Reference - Google Issue tracker priority levels

Screenshots/Video

The proper image can be seen in right bottom corner.

Desktop

• OS: Ubuntu 22.04
• Browser: Firefox
• Resolution: 1920x1080
• Version: Latest master branch 2023/03/28 14:42 CET

Additional context

The problem has started occurring sometime after #1087

[Keavon]

Regression from #1065 @0HyperCube