(graphics): enlarge the viewport for distorsion remap
Description
When using SDistortion and the remap compositor, one can notice that the 3D rendering looks somehow "cropped" on the edges of the viewport. Indeed, we would need to render in a larger viewport so that we cover the whole target viewport after the lens distorsion.
Proposal
This does not seems obvious to enlarge a single layer of SRender as its size is linked with the Qt widget. Moreover we might need to modify the remap shader to take this bigger size into account.