suggested fix for autocall failure (#14555)

Closes :  #14513

Following the recommendation in that Issue seems to fix the autocall
issue (for at least the reproduction case)

FYI: @Carreau since I saw you were assigned to the Issue.

I only did the manual verification of the example case in the issue.

IPython/core/prefilter.py

@@ -512,8 +512,10 class AutocallChecker(PrefilterChecker):
             callable(oinfo.obj)
             and (not self.exclude_regexp.match(line_info.the_rest))
             and self.function_name_regexp.match(line_info.ifun)
-            and line_info.raw_the_rest.startswith(" ")
+            and (
+                line_info.raw_the_rest.startswith(" ")
             or not line_info.raw_the_rest.strip()
+            )
         ):
             return self.prefilter_manager.get_handler_by_name("auto")
         else:

IPython/core/tests/test_prefilter.py

@@ -137,3 +137,13 def test_autocall_should_support_unicode():
     finally:
         ip.run_line_magic("autocall", "0")
         del ip.user_ns["π"]
+
+
+def test_autocall_regression_gh_14513():
+    ip.run_line_magic("autocall", "2")
+    ip.user_ns["foo"] = dict()
+    try:
+        assert ip.prefilter("foo") == "foo"
+    finally:
+        ip.run_line_magic("autocall", "0")
+        del ip.user_ns["foo"]