With no frontend attached, a detached session's messages go after MessageLinger

A message lingers until input dismisses it, and a detached session with nobody
attached has no input: its messages, and /screen, kept what was said long ago.
The session now marks the core unattended while no client is attached, and
the core drops a pane's messages once the newest has been up MessageLinger on
the clock, checked as it is stepped or served. A pane's older lines go with
its newest rather than each on its own clock; the render pipeline's clock is
the place for that.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index c049fa39..2eab3d62 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -3806,6 +3806,9 @@ pub const Pardes = struct {
     /// it is dragged instead of once on release.
     native_image_patches: bool = false,
     quit: bool = false,
+    /// A detached session with no frontend attached: nothing renders, so
+    /// no input ever dismisses a message (Messages.expireUnattended).
+    unattended: bool = false,
     haptic: HapticSlot = if (platform == .macos) .none else {},
     drag: mouse.Drag = .none,
     hover_col: u16 = 0,
@@ -4672,6 +4675,7 @@ pub const Pardes = struct {
     /// that changes a pane costs a frame, which is why a round trip on a
     /// local socket costs microseconds and not a vsync.
     pub fn serveFs(p: *Pardes, req: ctlfs.Req) ctlfs.Reply {
+        Messages.expireUnattended(p);
         if (!ctlfs.changesPane(req)) return ctlfs.handle(p, req);
         p.needs_frame = true;
         p.raw_hover_intent = false;
@@ -4694,6 +4698,7 @@ pub const Pardes = struct {
         // the screen.
         p.needs_frame = p.needs_frame or ev != .tick;
         p.shell_rows.sweep(p.gpa);
+        Messages.expireUnattended(p);
         // An announcement stands in only until its own step says more.
         for (p.panes) |slot| if (slot) |pane| {
             pane.msg_announcement = false;