listener: fix hang when stringifying output.

The issue is that when *listener-pprint-p* is set, then
the evaluation is printed using pprinl. The user may have
arranged for that to safely work when there are circular
objects in the print. But then the listener ignores
*listener-pprint-p* when saving the output object as a string
(which is done for the sake of the Ctrl-X Ctrl-P
paste-previous-output feature). The tostring function is used
which can blow up on an object containing circular structure,
even though the object was successfully printed.
The user is puzzled: why was the result of the evaluation
printed completely and perfectly, yet the image has hanged?

* parser.c (repl): Do not use tostring for converting the
evaluated output to a string. Choose between tostring and
tostringp based on the *listener-pprint-p* variable.

0 files changed, 0 insertions, 0 deletions