[vscode] update extensions, set spell checking to UK

.devcontainer/devcontainer.json

@@ -20,11 +20,14 @@
         "vscode": {
             "extensions": [
                 "bierner.github-markdown-preview",
+                "bierner.markdown-preview-github-styles",
                 "bungcip.better-toml",
-                "streetsidesoftware.code-spell-checker",
-                "lextudio.restructuredtext",
+                "eamodio.gitlens",
                 "ms-python.python",
-                "omnilib.ufmt"
+                "omnilib.ufmt",
+                "redhat.vscode-yaml",
+                "streetsidesoftware.code-spell-checker",
+                "tht13.rst-vscode"
             ]
         }
     },

.vscode/settings.json

@@ -5,6 +5,7 @@
         "editor.defaultFormatter": "omnilib.ufmt",
         "editor.formatOnSave": true
     },
+    "cSpell.language": "en-GB",
     "cSpell.words": [
         "backported",
         "behaviour",

py_trees/decorators.py

@@ -920,3 +920,30 @@ def update(self) -> common.Status:
             the behaviour's new status :class:`~py_trees.common.Status`
         """
         return self.decorated.status
+
+
+class PassThrough(Decorator):
+    """
+    This decorator simply reflects the child's current status.
+
+    This behaviour is useful for debugging or visualisation purposes.
+    """
+
+    def __init__(self, name: str, child: behaviour.Behaviour):
+        """
+        Initialise with the standard decorator arguments.
+
+        Args:
+            name: the decorator name
+            child: the child to be decorated
+        """
+        super(PassThrough, self).__init__(name=name, child=child)
+
+    def update(self) -> common.Status:
+        """
+        Just reflect the child status.
+
+        Returns:
+            the behaviour's new status :class:`~py_trees.common.Status`
+        """
+        return self.decorated.status