Selection and canvas bounds?

[PixLab]

(06-27-2021, 09:47 AM)Ottia Tuota Wrote: Is it possible to have the selection extend outside of the canvas?

Yes and No.
Yes while using a selection tool you will be able to go outside of the canvas, but what's really selected is on the canvas (marching ants will tell you what's really selected).

(06-27-2021, 09:47 AM)Ottia Tuota Wrote: In some of my plugins I have the following situation: The plugin works on a path. I want to restrict the effect to some part of the path. For this I use a selection. But a path can go outside of the canvas. Does this mean that anchors outside of the canvas cannot be chosen using a selection?

The plugin works on a path ... Which plugin?
by anchors do you mean "nodes" / "control point"? if so, you can select multiple nodes with Shift down then click the control points you need to select, even outside of the canvas

I need you to be more explicit about what exactly you would like to achieve... screenshot are often worth thousands words .
because I can't picture out why you do need to go outside the canvas with a selection on a path ... => what does your plugin do?

Paths can go outside because paths can be used for many purpose other than path, like a guide (for a vanishing point for example) and you can even activate "snap to path"

https://docs.gimp.org/2.10/en/gimp-tool-path.html