zsh completion: discard progress from internal bazel invocations
When computing completion options, bazel has to be called. For those
calls, discard the progress output (on stderr) to avoid them messing
up the terminial. Fixes
@@ -40,7 +40,7 @@ local curcontext="$curcontext" state line
: ${BAZEL_COMPLETION_PACKAGE_PATH:=%workspace%}
: ${BAZEL:=bazel}
-b() { ${BAZEL} --noblock_for_lock "$@"; }
+b() { ${BAZEL} --noblock_for_lock "$@" 2>/dev/null; }
# Default cache lifetime is 1 week
zstyle -s ":completion:${curcontext}:" cache-lifetime lifetime
