resize canvas to selection

Strange. I carefully tried it before posting, but it now works for me, too.
Thanks for your tip.

It does for me! I made a layer, moved it so that half of the layer was outside the visible canvas area, then used the crop tool. I was able to snap to all the sides of the layer, including the edges that fell outside of the visible range. (it snapped to a point outside in the grey part of the work area.) Executing the crop changed the canvas dimensions to correspond to the edges of the layer.

OK, admittedly my sentence didn't make any sense. What I wanted to say:

The dummy-layer workaround does not work if any 1 of the 4 borders of the selection (or the dummy-layer for that matter) is outside the current canvas.

What does that mean?

The dummy-layer workaround does not work if any 1 of the 4 canvas borders is outside the current canvas.

Turns out it was all down to terminological inexactitude.

Thanks J.
Okay 1+2 is what I mentioned. And 3) does not resize the canvas, it delete-crops the image.

>which OTHER method of canvas resizing did you use than "image>>canvas size" ?? (or did you mean the hide-crop method?)

1) Crop tool
2) Canvas size dialog
3) Selection, then image... crop