Resize or extend a cairo surface

The situation is that my python script is rendering svg images to a
cairo.Context, which is attached to a cairo.ImageSurface with set
dimensions. When the script 'runs out of space' to draw the svg images
I want it to effectively resize/extend the surface dimensions to make
space for more svg images.

(I cannot preallocate the space because I don't know the number or
size of the images in advance.)

From what I have read I understand that you cannot actually resize a
cairo surface, the solution seems to be to copy the old surface to a
new larger surface, is this correct?

What is the best way to go about this?


Thanks

Benjamin
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