Making a perspective grid

[Ofnuts]

Trick: sometimes it can be easier to

• create a temporary layer, smaller that the image (for instance, encompassing the useful part of the path)
  
• optionally stroke the path on that layer
  
• click the "link" icon on both the layer and the path
  
• apply the transform on the layer
  
• let Gimp automatically apply the same transform on the path