A restored pane whose file is gone from disk comes back dirty, and Del asks before throwing its text away

A dump keeps a pane's text. Restored after its file was deleted, the pane
came back clean: the watch's baseline read of the missing file failed
quietly, and Del closed it without a word. Its text was then nowhere at
all. Restore now checks the file: a local path with nothing on disk comes
back as one deleted on disk, as the watch would have said. It says so
once, logs `changed N deleted`, and is dirty, so Del, Exit and Restore
ask first.

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

1 files changed, 15 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 9a95a10f..549aa265 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -2525,6 +2525,21 @@ test "Kill with a name and nothing running says so and does not fail, as bare Ki
     try testing.expect(th.logHas(p, "Kill: nothing running"));
 }
 
+test "a restored pane whose file is gone from disk comes back dirty, and Del asks first" {
+    if (comptime !pardes.hosted) return error.SkipZigTest;
+    const p = try withFile(testing.allocator, "kept text\n");
+    defer p.deinit();
+    try pane_files.nameBuffer(p, 0, "/tmp/pardes-restore-gone-xyz/f.txt", false);
+    try pardes.dump.dumpState(p);
+    const restored = try pardes.dump.restore(p, p.dump_out.?, "/tmp/pardes.dump.zon");
+    defer restored.deinit();
+    const again = restored.panes[restored.paneBySerial(restored.panes[0].?.serial).?].?;
+    try testing.expect(again.file.?.disk_gone);
+    const r = wr(restored, Node.of(again.serial, .ctl), "Del\n");
+    try testing.expectEqual(Status.err, r.reply.status);
+    try testing.expect(std.mem.indexOf(u8, r.reply.ename, "Modified") != null);
+}
+
 test "a line starting with # runs as nothing at an exec or a ctl, silently" {
     const p = try withFile(testing.allocator, "x\n");
     defer p.deinit();