Merge remote-tracking branch 'upstream/master' into mm

Conflicts:
- 	src/_pytest/cacheprovider.py

testing/test_cacheprovider.py

@@ -982,8 +982,13 @@ class TestNewFirst:
         )
         testdir.tmpdir.join("test_1/test_1.py").setmtime(1)
 
-        result = testdir.runpytest("-v", "--nf")
+        # Running only a subset does not forget about existing ones.
+        result = testdir.runpytest("-v", "--nf", "test_2/test_2.py")
+        result.stdout.fnmatch_lines(
+            ["*test_2/test_2.py::test_1[1*", "*test_2/test_2.py::test_1[2*"]
+        )
 
+        result = testdir.runpytest("-v", "--nf")
         result.stdout.fnmatch_lines(
             [
                 "*test_1/test_1.py::test_1[3*",

testing/test_tmpdir.py

@@ -383,6 +383,10 @@ class TestRmRf:
             on_rm_rf_error(os.unlink, str(fn), exc_info, start_path=tmp_path)
             assert fn.is_file()
 
+        # we ignore FileNotFoundError
+        exc_info = (None, FileNotFoundError(), None)
+        assert not on_rm_rf_error(None, str(fn), exc_info, start_path=tmp_path)
+
         # unknown function
         with pytest.warns(pytest.PytestWarning):
             exc_info = (None, PermissionError(), None)