getRenderedContent uses the context document instead of the target document

Follow this steps to reproduce:

• create a new document called X.A
• attach an image to X.A
• set the content of X.A to:

  image:attachedImage.png
  

  (replace attachedImage.png with the name of your image)

• create a new document called X.B
• set the content of X.B to:

  {{velocity}}{{html}}$xwiki.getDocument("X.A").getRenderedContent(){{/html}}{{/velocity}}
  

As a result the image is visible on X.A but not on X.B. If you look at the HTML of X.B you can see that the image is considered to be an attachment of X.B instead of X.A:

/xwiki/bin/download/X/B/attachedImage.png

while the HTML of X.A has (correctly):

/xwiki/bin/download/X/A/attachedImage.png