1 files changed, 14 insertions, 3 deletions
diff --git a/src/detached/client.zig b/src/detached/client.zig
index 4769cf25..fc39164b 100644
--- a/src/detached/client.zig
+++ b/src/detached/client.zig
@@ -1129,9 +1129,20 @@ test "detached session: a frontend that stops reading is dropped, not waited for
     for (0..24) |_| {
         if (!h.session.clients[1].attached) break;
         host.vtable.push_set_clipboard.?(host.ctx, text);
-        try h.pump();
-        try good.wait(5);
-        while (try good.next()) |_| {}
+        // Read `good` back to EMPTY before the next mirror, rather than
+        // pumping once and taking whatever one write fitted. One pump moves at
+        // most one socket buffer, and that buffer is 8 KiB here
+        // (`net.local.stream.sendspace` on Darwin) against Linux's 208 KiB —
+        // so a single pump per 256 KiB mirror leaves the READING frontend
+        // falling behind by a quarter megabyte a round and closes it for a
+        // backlog it never caused. The claim under test is that a frontend
+        // that reads survives, so it has to actually finish reading.
+        for (0..256) |_| {
+            try h.pump();
+            try good.wait(5);
+            while (try good.next()) |_| {}
+            if (h.session.clients[0].out.items.len == 0) break;
+        }
     }
     // Dropped rather than queued without bound, and rather than the core
     // blocking on it.