GIMP: How to move a selection in a layer?

Question 1

I’m having a weird behavior when trying to move a selected rectangle or polygon in a layer.
I do the next:

select layer

I want to move the shine that belongs to the brillos y manchas layer:

shine

select polygon

The selection is the small polygon.

move selection

but it’s not moved.

not moved

The first that came into my head is that the shine didn’t belong to that layer, but it does. Any idea on what I am doing wrong?

Question 2

Your move tool is set to move the selection, not the area selected by.

You should:

Transform your selection to a float selection using Select->Float
In the move tool options choose to move Layer instead to Selection (by pressing the first icon near “Mover” in “Opciones de herramienta”)

Now, it should be possible to move the shine.

Answer