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, 2 insertions, 0 deletions

diff --git a/src/builtins.zig b/src/builtins.zig
index 780d0bb7..5fdabd87 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -227,6 +227,8 @@ pub const registry = struct {
                 // are the default
                 .toggle, .transition, .scene, .dump_dir, .choice, .lift, .shader_animation, .motion, .shell => false,
                 .theme, .font, .tagline_size, .window_opacity, .window_blur, .message_ms, .shader, .inactive_dim, .grip_width => true,
+                // bare, it says the width (exec.applySettingBuiltin)
+                .tab => false,
             };
         unreachable;
     }