Keep a pane's filesystem state on the Pane instead of a slot-indexed table

addr, limit, the event queue and its readers, pty/data's queue, a waiting
run and the /log announcement flag lived in p.fs.panes[slot], reset when
the pane went; a reused slot is how the bug class came in. acme keeps the
same state on its Window (editors/acme/dat.h:226-266), so now Pane.fs
holds it: announced, retired (noteRetire, which still answers a waiting
run and drops the listener count first) and freed with the pane itself.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/test/output.zig b/test/output.zig
index 7c80e105..cda5f556 100644
--- a/test/output.zig
+++ b/test/output.zig
@@ -1082,7 +1082,7 @@ test "identical result refresh keeps warm content caches without allocation" {
         try std.testing.expectEqual(id, source.search_pane.?);
         try std.testing.expectEqual(@as(usize, 1), source.search_row.?);
         try std.testing.expectEqual(result.serial, p.look_walk_owner.?);
-        try std.testing.expect(p.fs.panes[id].events.empty());
+        try std.testing.expect(p.panes[id].?.fs.events.empty());
     }
 
     try panes.Output.fillResults(p, 0, "/tmp", .{ .query = .references }, "changed", try p.gpa.dupe(u8, "short\n"), null);
@@ -1099,7 +1099,7 @@ test "identical result refresh keeps warm content caches without allocation" {
     try std.testing.expectEqual(@as(usize, 0), file.scroll);
     try std.testing.expectEqual(@as(i32, 0), result.hscroll);
     try std.testing.expect(source.search_row == null);
-    const events = &p.fs.panes[id].events;
+    const events = &p.panes[id].?.fs.events;
     try std.testing.expect(std.mem.startsWith(u8, events.peek().?, "KD"));
     events.pop();
     try std.testing.expect(std.mem.startsWith(u8, events.peek().?, "KI"));