Columns are named by stable serials over 9P, as panes are

/col/<n> named a column by its index, which shifts when a column left of it
closes: exactly what scripts trip on. A column is now /col/<serial>, its
serial kept while it lives and never reused; /layout lines give serial and
index (`<serial> <index> ...`), active names the serial, /index's last
field is the column's serial, and the log says newcol and delcol with
serials. Docs, the skill and the tree's README say so.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/src/ninep/events.zig b/src/ninep/events.zig
index fc410d5a..e918f09a 100644
--- a/src/ninep/events.zig
+++ b/src/ninep/events.zig
@@ -174,7 +174,7 @@ pub fn noteError(p: *Pardes, req: Req, reply: Reply) void {
             .top => |f| file = f.fileName(),
             .col => |c| {
                 serial = "-";
-                file = std.fmt.bufPrint(&name, "col/{d}/tag", .{c.index}) catch "col";
+                file = std.fmt.bufPrint(&name, "col/{d}/tag", .{c.serial}) catch "col";
             },
             .pane => |pt| {
                 serial = std.fmt.bufPrint(&name, "{d}", .{pt.serial}) catch "-";