A 9P look keeps its leading blanks: an indented line, or blanks alone, is looked for as written

Every line written to look or exec went through Messages.next, which
trimmed blanks from both ends. A look of `    indented` then found the
first bare `indented`, and a diff's blank context line ` ` looked at
nothing. A look's line is now its text: only its `\r` and newline go.
lookAt keeps the blanks for the word search too; it expands `~` only for
a look that starts with one, and the path, address and command readings
trim for themselves as before. runSearch keeps a pattern's blanks, since
a builtin's argument comes trimmed already. An exec line is trimmed as
before. fs.md says so.

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

1 files changed, 7 insertions, 2 deletions

diff --git a/test/monkey9p.py b/test/monkey9p.py
index 89751145..64b82832 100644
--- a/test/monkey9p.py
+++ b/test/monkey9p.py
@@ -698,8 +698,13 @@ def allowances(res, path, data, sizes, room):
     (acme's xfid.c:842) or run as the Look builtin; an Edit block whose text
     never ended runs, and fails, at the close."""
     base = path.rsplit('/', 1)[-1]
-    lines = [line for line in served_lines(data, sizes, room) if line.strip()]
-    if base in ('look', 'event'):
+    served = served_lines(data, sizes, room)
+    lines = [line for line in served if line.strip()]
+    if base == 'look':
+        # A look's line is its text, blanks and all: one of blanks alone
+        # is a look too (fs.md); only an empty one (or a lone \r) is none.
+        n = len([line for line in served if line.rstrip(b'\r')])
+    elif base == 'event':
         n = len(lines)
     elif base in ('exec', 'ctl', 'tagexec'):
         n = sum(1 for line in lines if line.split()[:1] == [b'Look'])