reinstate CommandCollection support

src/rich_click/__init__.py

@@ -12,6 +12,7 @@
 # We need to manually import these instead of `from click import *` to force mypy to recognize a few type annotation overrides for the rich_click decorators.
 from click.core import Argument as Argument
 from click.core import Command as Command
+from click.core import CommandCollection as CommandCollection
 from click.core import Context as Context
 from click.core import Group as Group
 from click.core import Option as Option
@@ -76,6 +77,7 @@
 from rich_click.decorators import pass_context as pass_context
 from rich_click.decorators import rich_config as rich_config
 from rich_click.rich_command import RichCommand as RichCommand
+from rich_click.rich_command import RichCommandCollection as RichCommandCollection
 from rich_click.rich_command import RichGroup as RichGroup
 from rich_click.rich_context import RichContext as RichContext
 from rich_click.rich_help_configuration import RichHelpConfiguration as RichHelpConfiguration

src/rich_click/rich_command.py

@@ -212,3 +212,17 @@ def command(
             # (The command_class ClassVar was not added until 8.0.)
             kwargs.setdefault("cls", self.command_class)
             return super().command(*args, **kwargs)  # type: ignore[no-any-return]
+
+
+class RichCommandCollection(RichGroup, click.CommandCollection):
+    """Richly formatted click CommandCollection.
+
+    Inherits click.CommandCollection and overrides help and error methods
+    to print richly formatted output.
+    """
+
+    @wraps(click.CommandCollection.__init__)
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        """Initialize RichCommandCollection class."""
+        click.CommandCollection.__init__(self, *args, **kwargs)
+        self._register_rich_context_settings_from_callback()