Attempt at a compromise format that is split over 2 lines

New format looks like:

```sh
myapp> set allow_style always
allow_style: 'Terminal'
          -> 'Always'
```

Where "'Terminal'" is red and "'Always'" is green.

This is still more abbreviated than the original format, but not as abbreviated as putting everything on one line. Moreover, it preserves the more colorful diff-style display and the switch to using pfeedback.

Author: tleonhardt

cmd2/cmd2.py

@@ -4732,7 +4732,9 @@ def do_set(self, args: argparse.Namespace) -> None:
                         args.param,
                         ": ",
                         (f"{orig_value!r}", "red"),
-                        " -> ",
+                        "\n",
+                        " " * max(0, len(args.param) - 1),
+                        "-> ",
                         (f"{settable.value!r}", "green"),
                     )
                     self.pfeedback(feedback_msg)

tests/test_cmd2.py

@@ -273,7 +273,8 @@ def test_set_with_choices(base_app) -> None:
     out, err = run_cmd(base_app, f"set fake {fake_choices[1]}")
     assert base_app.last_result is True
     assert not out
-    assert err == [f"fake: {fake_choices[0]!r} -> {fake_choices[1]!r}"]
+    assert err[0].startswith(f"fake: {fake_choices[0]!r}")
+    assert err[1].endswith(f"-> {fake_choices[1]!r}")
 
     # Try an invalid choice
     _out, err = run_cmd(base_app, "set fake bad_value")
@@ -892,12 +893,13 @@ def test_base_timing(base_app) -> None:
     base_app.feedback_to_output = False
     out, err = run_cmd(base_app, "set timing True")
     assert not out
-    assert err[0] == "timing: False -> True"
+    assert err[0].startswith("timing: False")
+    assert err[1].endswith("-> True")
 
     if sys.platform == "win32":
-        assert err[1].startswith("Elapsed: 0:00:00")
+        assert err[2].startswith("Elapsed: 0:00:00")
     else:
-        assert err[1].startswith("Elapsed: 0:00:00.0")
+        assert err[2].startswith("Elapsed: 0:00:00.0")
 
 
 def test_base_debug(base_app) -> None:
@@ -912,7 +914,8 @@ def test_base_debug(base_app) -> None:
     # Set debug true
     out, err = run_cmd(base_app, "set debug True")
     assert not out
-    assert err == ["debug: False -> True"]
+    assert err[0].startswith("debug: False")
+    assert err[1].endswith("-> True")
 
     # Verify that we now see the exception traceback
     out, err = run_cmd(base_app, "edit")

tests/test_commandset.py

@@ -1104,7 +1104,8 @@ def __init__(self) -> None:
     # change the value and verify the value changed
     out, err = run_cmd(app, "set arbitrary_value 10")
     assert not out
-    assert err == ["arbitrary_value: 5 -> 10"]
+    assert err[0].startswith("arbitrary_value: 5")
+    assert err[1].endswith("-> 10")
     out, err = run_cmd(app, "set arbitrary_value")
     any("arbitrary_value" in line and "10" in line for line in out)