Enable --pretty by default

Author: victorletichevsky

mypy/options.py

@@ -357,7 +357,7 @@ def __init__(self) -> None:
         self.hide_error_codes = False
         self.show_error_code_links = False
         # Use soft word wrap and show trimmed source snippets with error location markers.
-        self.pretty = False
+        self.pretty = True
         self.dump_graph = False
         self.dump_deps = False
         self.logical_deps = False

mypy/test/testcheck.py

@@ -128,6 +128,7 @@ def run_case_once(
         options = parse_options(original_program_text, testcase, incremental_step)
         options.use_builtins_fixtures = True
         options.show_traceback = True
+        options.pretty = True
 
         # Enable some options automatically based on test file name.
         if "columns" in testcase.file: