listener: fix completion regression.

This problem was was introduced in TXR 239 in commit
1f54ad5cc1d384d0818a6bf6cec20a95ecc5a5ae. The completion for
package-qualified symbols and keywords is wonky.

* parser.c (find_matching_syms): The first argument to scat is
the separator, so we must specify it as nil.

1 files changed, 1 insertions, 1 deletions

diff --git a/parser.c b/parser.c
index 2c61c742..0ccee3c1 100644
--- a/parser.c
+++ b/parser.c
@@ -970,7 +970,7 @@ static void find_matching_syms(lino_completions_t *cpl,
         continue;
 
       if (qualify)
-        comple = scat(line_prefix, pkg_name, lit(":"), name, nao);
+        comple = scat(nil, line_prefix, pkg_name, lit(":"), name, nao);
       else
         comple = scat2(line_prefix, name);