FURB129 fix should add spaces between tokens #17683
Description
Summary
The fix for readlines-in-for (FURB129) can introduce a syntax error when .readlines() is followed immediately by a keyword without white space.
$ cat >furb129.py <<'# EOF'
with open("furb129.py") as f:
print([line for line in f.readlines()if True])
# EOF
$ ruff --isolated check --select FURB129 --unsafe-fixes --diff furb129.py 2>&1 | grep error:
error: Fix introduced a syntax error. Reverting all changes.Version
ruff 0.11.7 (f7b4851 2025-04-24)