An unsaved pane restored from a dump that says nothing of its disk (no disk_hash, an older dump) asks at its first Save, as for a file changed on disk

What its text was read against is unknown, so a Save could write over
a newer file without a word; it now asks once first.

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

1 files changed, 19 insertions, 0 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index 16fbabb4..554333bb 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -4409,3 +4409,22 @@ test "a command or a terminal refused for room is refused before anything is log
         p.update(.{ .resize = .{ .cols = 80, .rows = 24 } });
     }
 }
+
+test "an unsaved pane from a dump that says nothing of its disk asks at its first Save" {
+    if (comptime !pardes.hosted) return;
+    const gpa = testing.allocator;
+    var tmp = testing.tmpDir(.{});
+    defer tmp.cleanup();
+    try tmp.dir.writeFile(testing.io, .{ .sub_path = "old.txt", .data = "disk\n" });
+    var dir_buf: [4096]u8 = undefined;
+    const dir = dir_buf[0..try tmp.dir.realPath(testing.io, &dir_buf)];
+    var path_buf: [4200]u8 = undefined;
+    const path = try std.fmt.bufPrint(&path_buf, "{s}/old.txt", .{dir});
+    const p = try withFile(gpa, "x\n");
+    defer p.deinit();
+    const id = p.freeSlot().?;
+    const pane = try pardes.panes.File.restore(p, id, .{ .kind = .file, .tag = "", .body = "", .file = .{ .path = path, .content = "unsaved\n", .dirty = true } });
+    try testing.expect(pane.file.?.disk_newer != null);
+    pardes.exec.saveFile(p, id);
+    try testing.expect(th.logHas(p, "modified on disk since read (Save again to overwrite)"));
+}