A terminal's Tty word names its shell, Tty+fish, and a click on it opens another

A terminal's tag said Tty whatever shell it ran. The host's acknowledgement
of the shell it forked now sets the word to Tty+<shell>, tinted like the tag's
name. Word+arg is taken as Word arg, one word a tag can hold and a click can
take whole (+ is a word character), so Tty+fish opens a terminal on fish, as
Tty fish does; Tty takes the shell as its argument, which the host forks for
that pane instead of the configured one. Every snapshot whose screen shows a
terminal's tag changes: 69 goldens, re-recorded by name, whose 297 changed
lines are all Tty becoming Tty+bash (the harness runs bash), the cursor
columns and style spans that moved with it, or that text cut at a pane's
width.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/src/panes.zig b/src/panes.zig
index a7f7f69f..2f8b6b56 100644
--- a/src/panes.zig
+++ b/src/panes.zig
@@ -109,6 +109,13 @@ pub const Pane = struct {
     /// shown `exit ?`).
     command_done: bool = false,
     command_status: ?u8 = null,
+    /// The shell a terminal runs when it is not the configured one (`Tty
+    /// fish`), owned.
+    shell: ?[]u8 = null,
+    /// An interactive terminal's tag text naming its shell, ` Tty+fish ...`
+    /// (Pardes.acknowledgeShell); empty until the host says which it ran.
+    shell_tail: [96]u8 = undefined,
+    shell_tail_len: u8 = 0,
     /// The revision an Exit or a Restore last warned this pane was modified
     /// at, and which of them: only that word goes ahead on the warning
     /// (builtins.zig warnModified).