Zerox twins survive a Dump and Restore: their text is dumped once, in the first, each other twin names it (twin_of), and Restore puts them back on one buffer with their dots

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 30 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 973f87e2..ae68ed91 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -1995,6 +1995,36 @@ test "a Get file that fails changes nothing: no such file, a directory, or unsav
     try testing.expectEqualStrings("here\nmore\n", pane.file.?.content);
 }
 
+test "Zerox twins dump their text once and come back on one buffer from a Restore" {
+    const p = try withFile(testing.allocator, "one\ntwo\n");
+    defer p.deinit();
+    const first = serialOf(p);
+    _ = wr(p, Node.of(first, .name), "/tmp/pardes-zerox-dump.txt\n");
+    _ = wr(p, Node.of(first, .body), "unsaved " ** 64 ++ "\n");
+    try testing.expect(p.executeBuiltinLine(0, "Zerox"));
+    try testing.expect(p.executeBuiltinLine(0, "Zerox"));
+    try pardes.dump.dumpState(p);
+    const text = p.dump_out.?;
+    // The text is kept once though three panes show it.
+    const encoded = try pardes.dump.encodeBytes(p.scratch.allocator(), p.panes[0].?.file.?.content);
+    try testing.expectEqual(@as(usize, 1), std.mem.count(u8, text, encoded));
+    const restored = try pardes.dump.restore(p, text, "/tmp/pardes.dump.zon");
+    defer restored.deinit();
+    var files: [3]*pardes.panes.File.State = undefined;
+    var n: usize = 0;
+    for (restored.panes) |slot| if (slot) |pane| if (pane.file) |*f| if (std.mem.eql(u8, f.path, "/tmp/pardes-zerox-dump.txt")) {
+        files[n] = f;
+        n += 1;
+    };
+    try testing.expectEqual(@as(usize, 3), n);
+    for (files[1..]) |f| {
+        try testing.expectEqual(files[0].content.ptr, f.content.ptr);
+        try testing.expectEqual(files[0].history, f.history);
+        try testing.expect(f.twin != 0 and f.twin == files[0].twin);
+    }
+    try testing.expect(std.mem.startsWith(u8, files[0].content, "one\ntwo\nunsaved "));
+}
+
 test "a body write to a terminal is typed input, not a paste, even to a program that asked for bracketed paste" {
     const p = try Pardes.init(testing.allocator, .{ .cols = 90, .rows = 30 });
     defer p.deinit();