(Thanks for all your replies to my issues @elextr - I know I've been posting a lot and fixing nothing myself, but I have too many backlogged commitments right now to start making pull requests.)

This patch resolves the problem, simply by matching the spawn API line limit to the messaging window limit...

diff --git a/src/spawn.c b/src/spawn.c
index 1560d71a..5fdea3b5 100644
--- a/src/spawn.c
+++ b/src/spawn.c
@@ -1219,7 +1219,7 @@ gboolean spawn_with_callbacks(const gchar *working_directory, const gchar *comma
                                {
                                        sc->cb.read = stdout_cb;
                                        sc->max_length = stdout_max_length ? stdout_max_length :
-                                               line_buffered ? 24576 : DEFAULT_IO_LENGTH;
+                                               line_buffered ? 1024 : DEFAULT_IO_LENGTH;
                                }
                                else
                                {

I have tested.

I don't see the patch as causing harm, but I haven't done a full review of every use of the spawn API to see what they are doing with their line output.

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