output panes remember the command that opened them

An output buffer was a file pane with a flag, and everything special about it
was re-derived from outside by asking the wrong question: the buffer NAME
("+Search", "+Help"), a parallel search_kind field, and f.output predicates
sprinkled through kind-agnostic code.

Now it carries its Origin — the Builtin, or the lsp.Kind for the five gotos
helix binds as motions rather than words — plus that command's argument, and
one Traits table answers every question the scattered code used to ask: what
it is called, whether n/N steps it, whether it is a doc for layout, whether
Esc dismisses it, whether it saves. The name is derived FROM the command
instead of being the thing that identifies it.

Adding a kind of output pane is adding a row. No golden moved.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/builtins.zig b/src/builtins.zig
index d32e4ed3..500ce264 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -198,7 +198,7 @@ pub const Ascii = struct {
 pub const Save = struct {
     pub fn run(c: Ctx) void {
         // an output buffer has no file behind it — nothing to write
-        if (c.pane.file) |f| if (!f.output) c.p.emit(.{ .save_file = .{ .pane = @intCast(c.id) } });
+        if (c.pane.file) |f| if (output_pane.fileTraits(f.output).saves) c.p.emit(.{ .save_file = .{ .pane = @intCast(c.id) } });
     }
 };