Tab N sets a tab's width in cells, 1 through 16, in every pane, drawn and counted (wrapping, clicks, the cursor); bare Tab says it; the ctl read and a Dump keep it

A session setting, not acme's per window: the width is read by File's pure
width functions (~130 callers that are given no pane), so it is one value,
config.tab_now, that Runtime.apply sets and a new session resets. A file:L:C
column counts runes, as compilers do, and never depended on it.

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

1 files changed, 4 insertions, 3 deletions

diff --git a/src/ninep/ctl.zig b/src/ninep/ctl.zig
index d0b1defb..188795de 100644
--- a/src/ninep/ctl.zig
+++ b/src/ninep/ctl.zig
@@ -409,7 +409,7 @@ pub fn paneText(p: *Pardes, pane: *Pane, buf: []u8) []const u8 {
     const f = pane_files.fileOf(pane);
     const undo = if (f) |file| file.history.undo_len > 0 else false;
     const redo = if (f) |file| file.history.redo_len > 0 else false;
-    w.print(" {d:>11} {d:>11} {d:>11} {s} ", .{ config.tab_width, @intFromBool(undo), @intFromBool(redo), if (current) "current" else "notcurrent" }) catch {};
+    w.print(" {d:>11} {d:>11} {d:>11} {s} ", .{ config.tab_now, @intFromBool(undo), @intFromBool(redo), if (current) "current" else "notcurrent" }) catch {};
     // A terminal bound as a REPL ends with its id, `python-a`.
     var idbuf: [48]u8 = undefined;
     const id = exec_line.replId(&idbuf, pane);
@@ -632,6 +632,7 @@ pub fn writeSettingsOf(p: *Pardes, s: *const config.Runtime, w: *std.Io.Writer)
             .motion => try w.print("{s} {s}\n", .{ word, @tagName(s.motion) }),
             .inactive_dim => try w.print("{s} {d}\n", .{ word, s.inactive_dim }),
             .grip_width => try w.print("{s} {d}\n", .{ word, s.grip_width }),
+            .tab => try w.print("{s} {d}\n", .{ word, s.tab }),
         }
     }
 }
@@ -1228,7 +1229,7 @@ test "pane ctl read is acme's fields -- index's five, width in cells, font, tab
     var want: std.ArrayList(u8) = .empty;
     defer want.deinit(gpa);
     try want.print(gpa, "{d:>11} {d:>11} {d:>11} {d:>11} {d:>11} {d:>11} {s} {d:>11} {d:>11} {d:>11} current ", .{
-        pane.serial, pane_files.tagOf(p, pane).len, @as(usize, 2), 0, 0, pane.cols, "default", config.tab_width, 0, 0,
+        pane.serial, pane_files.tagOf(p, pane).len, @as(usize, 2), 0, 0, pane.cols, "default", config.tab_now, 0, 0,
     });
     try testing.expectEqualStrings(want.items, a.bytes);
     try testing.expectEqual(@as(u64, a.bytes.len), call(p, .{ .tag = 1, .op = .getattr, .node = Node.of(pane.serial, .ctl) }).reply.attr.size);
@@ -3210,7 +3211,7 @@ test "acme's words run as pardes's (Put is Save, Delete a Del that does not ask)
     const p = try withFile(testing.allocator, "x\n");
     defer p.deinit();
     const serial = serialOf(p);
-    for ([_][]const u8{ "Snarf\n", "Zerox\n", "Tab\n", "Indent\n", "Local\n", "Abort\n" }) |line| {
+    for ([_][]const u8{ "Snarf\n", "Zerox\n", "Indent\n", "Local\n", "Abort\n" }) |line| {
         for ([_]u64{ Node.of(serial, .ctl), Node.of(serial, .exec) }) |node| {
             const r = wr(p, node, line);
             try testing.expectEqual(E.INVAL, r.errno());