add __repr__ to MagicsDisplay (#14378)

Here's more details on the `rich` side:

Textualize/rich#3317

I don't see a good reason not to overload `__repr__` in this use case

.github/workflows/python-package.yml

@@ -34,7 +34,7 @@ jobs:
  run: |
  darker -r 60625f241f298b5039cb2debc365db38aa7bb522 --check --diff . || (
  echo "Changes need auto-formatting. Run:"
- echo " darker -r 60625f241f298b5039cb2debc365db38aa7bb522"
+ echo " darker -r 60625f241f298b5039cb2debc365db38aa7bb522 ."
  echo "then commit and push changes to fix."
  exit 1
  )

IPython/core/magics/basic.py

@@ -40,6 +40,9 @@ def _lsmagic(self):
  def _repr_pretty_(self, p, cycle):
  p.text(self._lsmagic())
 
+ def __repr__(self):
+ return self.__str__()
+
  def __str__(self):
  return self._lsmagic()