scanner: Fix get_symbols/comments to maintain the scanner lists

Use g_slist_copy prior to returning the lists run through g_slist_reverse.
This preserves the source scanners internally held lists where previously
they would only point to a single element after a call, leaking memory and
breaking subsequent calls. Note the functions as (transfer container) and
use g_slist_free after calls in the Python bindings.
Add new unittest file: test_sourcescanner.py for isolated unittesting of the
SourceScanner.

https://bugzilla.gnome.org/show_bug.cgi?id=581525

1 files changed, 2 insertions, 0 deletions

diff --git a/giscanner/giscannermodule.c b/giscanner/giscannermodule.c
index 925b3e0a..b9512275 100644
--- a/giscanner/giscannermodule.c
+++ b/giscanner/giscannermodule.c
@@ -575,6 +575,7 @@ pygi_source_scanner_get_symbols (PyGISourceScanner *self)
       PyList_SetItem (list, i++, item);
     }
 
+  g_slist_free (symbols);
   Py_INCREF (list);
   return list;
 }
@@ -598,6 +599,7 @@ pygi_source_scanner_get_comments (PyGISourceScanner *self)
       PyList_SetItem (list, i++, item);
     }
 
+  g_slist_free (comments);
   Py_INCREF (list);
   return list;
 }