PY-29051: Fix breakpoints on lines that throw exceptions

Those lines were hit the first time. The subsequent times incorrect
caching prevented the breakpoints from activating

Also minor: provide cython type for 'stop' local

python/helpers/pydev/_pydevd_bundle/pydevd_frame.py

@@ -396,6 +396,7 @@ class PyDBFrame:
     #     cdef bint is_return;
     #     cdef str curr_func_name;
     #     cdef bint exist_result;
+    #     cdef bint stop;
     #     cdef dict frame_skips_cache;
     #     cdef tuple frame_cache_key;
     #     cdef tuple line_cache_key;
@@ -620,7 +621,7 @@ class PyDBFrame:
                     self.do_wait_suspend(thread, frame, event, arg)
                     return self.trace_dispatch
                 else:
-                    if not breakpoint and not is_return:
+                    if breakpoint is None and not (is_return or is_exception_event):
                         # No stop from anyone and no breakpoint found in line (cache that).
                         frame_skips_cache[line_cache_key] = 0
 

python/helpers/pydev/tests_pydevd_python/_debugger_case20.py

@@ -0,0 +1,15 @@
+def fn_with_except():
+    try:
+        raise Exception()
+    except:
+        pass
+
+
+def test_except():
+    fn_with_except()
+    fn_with_except()
+
+
+if __name__ == '__main__':
+    test_except()
+    print('TEST SUCEEDED')

python/helpers/pydev/tests_pydevd_python/test_debugger.py

@@ -226,6 +226,23 @@ class WriterThreadCase19(debugger_unittest.AbstractWriterThread):
 
         self.finished_ok = True
 
+#=======================================================================================================================
+# WriterThreadCase20 - [Test Case]: Breakpoint on line with exception
+#======================================================================================================================
+class WriterThreadCase20(debugger_unittest.AbstractWriterThread):
+
+    TEST_FILE = debugger_unittest._get_debugger_test_file('_debugger_case20.py')
+
+    def run(self):
+        self.start_socket()
+        self.write_add_breakpoint(3, 'fn_with_except')
+        self.write_make_initial_run()
+        for i in range(2):
+            thread_id, frame_id, line = self.wait_for_breakpoint_hit('111', True)
+            assert line == 3, 'Expected return to be in line 3, was: %s' % line
+            self.write_run_thread(thread_id)
+
+        self.finished_ok = True
 
 #=======================================================================================================================
 # WriterThreadCase18 - [Test Case]: change local variable
@@ -1347,6 +1364,10 @@ class Test(unittest.TestCase, debugger_unittest.DebuggerRunner):
     def test_case_19(self):
         self.check_case(WriterThreadCase19)
 
+    # PY-29051
+    def test_case_20(self):
+        self.check_case(WriterThreadCase20)
+
     if TEST_DJANGO:
         def test_case_django(self):
             self.check_case(WriterThreadCaseDjango)