review pass: fix the eaten Tab, drop the duplicated code, cover the gaps

1 files changed, 52 insertions, 0 deletions

diff --git a/test/snapshots/nested-optout.snap b/test/snapshots/nested-optout.snap
new file mode 100644
index 00000000..27e1ba3d
--- /dev/null
+++ b/test/snapshots/nested-optout.snap
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+# `--nested` is the documented escape hatch out of the hand-the-file-outward
+# mechanism, and nested.snap covers only the mechanism. The flag says two
+# things at once and both are asserted here: an instance carrying it keeps its
+# own argument instead of forwarding it, AND it is not an outer instance for
+# anything launched inside IT (tty.zig binds no socket when opts.nested).
+#
+# The same trick nested.snap uses to get a genuine descendant: a pane shell's
+# parent IS the app under test, so `$(readlink /proc/$PPID/exe)` in a pane is
+# this exact binary. What discriminates is the GRID — a second topbar drawn
+# INSIDE the pane, with the outer instance still one shell wide.
+#
+# Long waits on purpose: each arm forks and execs whole further pardes.
+file nested.txt optout-marker\nsecond-optout-line\n
+dirmk innerdir
+file innerdir/deeper.txt deepest-marker\n
+# --- a file argument, WITH the flag: the inner keeps it ---
+# Without --nested this is nested.snap's first arm and the outer grows a
+# file pane beside the shell. Here the outer's layout never changes: one
+# shell, and a whole second pardes drawn inside it holding nested.txt.
+start 30 100
+wait 8000 $
+stable 700 20000
+text $(readlink /proc/$PPID/exe) --nested nested.txt
+key enter
+wait 20000 optout-marker
+stable 700 20000
+snap optout-file
+# --- ...and it is not an outer instance either ---
+# The subshell is what makes the wait unambiguous: the inner boots in
+# `innerdir` while the outer pane's own shell stays in cwd, so `cwd/innerdir`
+# on the grid can only be the inner instance's tagline. --nested with no
+# argument is still a bare launch, so the inner comes up in tty mode and
+# keystrokes travel through both layers to its shell.
+start 30 100
+wait 8000 $
+stable 700 20000
+text (cd innerdir && $(readlink /proc/$PPID/exe) --nested)
+key enter
+wait 20000 cwd/innerdir
+stable 700 20000
+snap inner-shell
+# A third pardes, launched from inside the inner one. Its nearest pardes
+# ancestor is the INNER instance, which bound no socket, so the send fails and
+# it opens its own session where it stands — three topbars. The assertion is
+# the row it did NOT appear on: the outer instance is still one shell pane, and
+# a walk that had skipped past the opted-out instance would have put
+# deeper.txt up there beside it.
+text $(readlink /proc/$PPID/exe) deeper.txt
+key enter
+wait 20000 deepest-marker
+stable 700 20000
+snap inner-launch