Jan D. explained the problem, and I will just note that compiling
with -DSYNC_INPUT should lift that restriction (because it causes
XTread_socket to not be run from the signal handler any more).
Do you recall what the disadvantages of -DSYNC_INPUT were?
I think one disadvantage may have been that the Emacs window would
not refresh while something was busy. But I am not sure if that
disadvantage is real. Do you know?
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