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, 1 insertions, 1 deletions

diff --git a/test/panes.zig b/test/panes.zig
index 2f307cb5..e865641f 100644
--- a/test/panes.zig
+++ b/test/panes.zig
@@ -946,7 +946,7 @@ const ClickCursorTests = struct {
         defer _ = pardes.ctlfs.handle(p, .{ .tag = 0, .op = .release, .node = event_node, .handle = opened.handle });
 
         for ([_]pardes.Mouse.Button{ .middle, .right }) |button| {
-            const events = &p.fs.panes[0].events;
+            const events = &p.panes[0].?.fs.events;
             while (!events.empty()) events.pop();
             click(p, button, x + 2, y + 2);
             const selected = events.peek() orelse return error.MissingSelectionGesture;