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Before this commit, calling cairo_device_finish() on a cairo-script
context did not actually do anything in the backend. Thus, it was
possible to continue emitting output on the script context even after it
was finished, which means that API user had no way of preventing
use-after-free bugs in their write callback. Bug 277 triggers this via
detaching a snapshot, but I guess one could also simply continue drawing
to a script surface.
This commit implements the finish function by closing the underlying
stream.
However, that was not enough to fix things. This commit also turns
writing into a stream into a no-op after the stream was closed.
I checked that the new test case actually fails before this commit and
is indeed fixed by it.
Fixes: https://gitlab.freedesktop.org/cairo/cairo/-/issues/277
Signed-off-by: Uli Schlachter <psychon@znc.in>
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