Created attachment 132363 [details]
Archive containing the issue demonstration file

SUMMARY
When imported as File Layers, EXR files smaller than the picture itself will appear in the top-left corner, as usual, but since the 4.4.0 release, all empty space will be filled with black colour to match the size of the canvas, generating very large layers filled with unneeded information.

STEPS TO REPRODUCE
1. Unpack the FileLayerFillIssue.zip, which contains a .kra file and two small external files used as File Layer, pinkSquare.exr and pinkSquare.png.

2. Open the FileLayerFillIssue.kra file with Krita 4.3 ; the file layers are in the corner of the picture and background is still visible.

3. Open the FileLayerFillIssue.kra file with Krita 4.4 ; the file layers are in the corner of the picture, but background is not visible as the file layer referencing pinkSquare.exr filled all the canvas with opaque black. Layer thumbnail shows that this layer is now as large as the canvas itself ( Krita4_4FileLayerBehaviour.png shows a side-by-side comparison with the background using only the EXR file layer)

OBSERVED RESULT
File layer referencing the EXR external picture file introduced black opaque pixels in the empty space not covered by the picture file itself

EXPECTED RESULT
File layer referencing the EXR external picture file should left most of the picture empty, as does the file layer referencing the PNG external picture file

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Parabola Linux
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION