[cairo] How to draw an invisible rectangle?

[Tuom Larsen]

Hello,
Is it possible to draw a rectangle without a stroke and without a fill in
Cairo? You could ask what is it good for -- to mark a bounding box of an
object, for example. For vector programs which provide so called Outline
view or mode or Keyline. In another works -- I simply would not stroke() or
fill() them but then they will wait till the next path which could be
stroked() or filled() -- is it possible to discard current path?
Thanks!
T.
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