Interesting behaviour of selection

[DarkClown]

While playing around with snapping to grid functionality I discovered the following behaviour: First I created a pixel layer with a gradient (I guess it could have been anything). Than I did a rectangular selection on this layer. Added 3 rectangular shapes switches back to the pixellayer. The Selection got handles now (somehow strange). When moving the selection it left white areas under the area where the selection has been before. At first I thought it was a display problem (bad refresh or similar). But when exporting the blank areas remaind .. so for some reason the selection changed the content of the pixel layer. See in the video (I'm just going the the steps in the history to demonstrate the problem):

Video

Output file:

[MEB]

Hi DarkClown,

This is by design. If you create a selection and move it using the selection tools, only the selection will be moved as you'd expect. If you press and hold ⌘ (cmd) (CTRL if you are using Windows) while doing so you will move both the selection and the selection's contents. The Move Tool is also able to manipulate pixel selections but it will move the contents of the selection unless you are working with an empty layer (this is not exclusive to Affinity apps - other third party apps also behave the same way). The only difference maybe is that the Move Tool places handles around the pixel selection immediately so you can transform it directly without recurring to additional commands as if it was a shape. If the layer you are working with is not empty and you need to transform the selection without affecting the contents of the pixel selection, press Q to enter Quick Mask mode and transform the selection as you wish, then press Q again to quit Quick Mask mode.

[DarkClown]

Thanks for the explanation.