_get_line_with_reprcrash_message: remove duplicate prefix (#7)

Before:

> FAILED foo/test.py::test_bar - Failed: Database access not allowed, …

After:

> FAILED foo/test.py::test_bar - Database access not allowed, …

src/_pytest/terminal.py

@@ -14,6 +14,7 @@
 import pluggy
 import py
 from more_itertools import collapse
+from wcwidth import wcswidth
 
 import pytest
 from _pytest import nodes
@@ -990,8 +991,6 @@ def _get_pos(config, rep):
 
 def _get_line_with_reprcrash_message(config, rep, termwidth):
     """Get summary line for a report, trying to add reprcrash message."""
-    from wcwidth import wcswidth
-
     verbose_word = rep._get_verbose_word(config)
     pos = _get_pos(config, rep)
 
@@ -1011,8 +1010,13 @@ def _get_line_with_reprcrash_message(config, rep, termwidth):
         i = msg.find("\n")
         if i != -1:
             msg = msg[:i]
-        len_msg = wcswidth(msg)
 
+        # Remove duplicate prefix, e.g. "Failed:" from pytest.fail.
+        implicit_prefix = verbose_word.lower() + ":"
+        if msg[: len(implicit_prefix)].lower() == implicit_prefix:
+            msg = msg[len(implicit_prefix) + 1 :]
+
+        len_msg = wcswidth(msg)
         sep, len_sep = " - ", 3
         max_len_msg = termwidth - len_line - len_sep
         if max_len_msg >= len_ellipsis:

testing/test_skipping.py

@@ -1144,6 +1144,9 @@ def test_summary_list_after_errors(testdir):
         import pytest
         def test_fail():
             assert 0
+
+        def test_pytest_fail():
+            pytest.fail("fail exc")
     """
     )
     result = testdir.runpytest("-ra")
@@ -1152,6 +1155,7 @@ def test_fail():
             "=* FAILURES *=",
             "*= short test summary info =*",
             "FAILED test_summary_list_after_errors.py::test_fail - assert 0",
+            "FAILED test_summary_list_after_errors.py::test_pytest_fail - fail exc",
         ]
     )