Hi,
In 5.1beta1 appimage, when I drag'n'drop a *.jpg or *.png files on my canvas, the layer in the stack display an empty name.

To reproduce:
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1. Create a new canvas
2. On Dolphin file explorer (or any?) navigate to your jpg or png collection of pictures.
3. Drag'n'drop a picture on the canvas of Krita. 
4.  On the dialog select "Insert as a new layer"

Result:
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The layer inserted in the layer stack is unnamed: the slot has nothing.

Expected:
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The layer inserted is named like the filename (eg: background-texture.png) as it was on 5.0.6 and before.

(Note: same for pictures drag'n'droped from Firefox.)