_repr_failure_py: ignore pytrace=False with --full-trace (#140)

Alternative / related to pytest-dev#6232.
This is in line with pytest-dev#6247.

src/_pytest/nodes.py

@@ -303,12 +303,16 @@ def _prunetraceback(self, excinfo):
     def _repr_failure_py(
         self, excinfo: ExceptionInfo[Union[Failed, FixtureLookupError]], style=None
     ) -> Union[str, ReprExceptionInfo, ExceptionChainRepr, FixtureLookupErrorRepr]:
-        if isinstance(excinfo.value, Failed):
-            if not excinfo.value.pytrace:
-                return str(excinfo.value)
+        fulltrace = self.config.getoption("fulltrace", False)
+        if (
+            not fulltrace
+            and isinstance(excinfo.value, Failed)
+            and not excinfo.value.pytrace
+        ):
+            return str(excinfo.value)
         if isinstance(excinfo.value, FixtureLookupError):
             return excinfo.value.formatrepr()
-        if self.config.getoption("fulltrace", False):
+        if fulltrace:
             style = "long"
         else:
             self._prunetraceback(excinfo)

testing/test_runner.py

@@ -632,6 +632,17 @@ def teardown_function(function):
     result.stdout.fnmatch_lines(["world", "hello"])
     result.stdout.no_fnmatch_line("*def teardown_function*")
 
+    # But with --full-trace.
+    result = testdir.runpytest("--fulltrace")
+    result.stdout.fnmatch_lines(
+        [
+            "*def teardown_function*",
+            "E       Failed: world",
+            "E       Failed: hello",
+            "*= 1 failed, 1 error in *",
+        ]
+    )
+
 
 def test_pytest_fail_notrace_collection(testdir):
     """Test pytest.fail(..., pytrace=False) does not show tracebacks during collection."""