Fix max_depth recursion limit in gtkutils register_signals and add test cases corresponding to the bug

1 files changed, 5 insertions, 1 deletions

diff --git a/src/sugar/tutorius/gtkutils.py b/src/sugar/tutorius/gtkutils.py
index c5c1e12..1870dc4 100644
--- a/src/sugar/tutorius/gtkutils.py
+++ b/src/sugar/tutorius/gtkutils.py
@@ -158,7 +158,11 @@ def register_signals(target, handler, prefix=None, max_depth=None):
                     [p for p in (prefix, target.get_name()) \
                     if not (p is None or p in IGNORED_WIDGETS)] \
                 )
-                ret += register_signals(child, handler, pre, max_depth-1)
+                if max_depth is None:
+                    dep = None
+                else:
+                    dep = max_depth - 1
+                ret += register_signals(child, handler, pre, dep)
     name = ".".join( \
         [p for p in (prefix, target.get_name()) \
         if not (p is None or p in IGNORED_WIDGETS)] \