feat(python): add layout display dims unlinked to state

Author: seankmartin

python/neuroglancer/__init__.py

@@ -107,6 +107,7 @@
     LocalAnnotationLayer,  # noqa: F401
     ManagedLayer,  # noqa: F401
     Layers,  # noqa: F401
+    LinkedDisplayDimensions,  # noqa: F401
     LinkedPosition,  # noqa: F401
     LinkedZoomFactor,  # noqa: F401
     LinkedDepthRange,  # noqa: F401

python/neuroglancer/viewer_state.py

@@ -1482,6 +1482,14 @@ class Linked(LinkedType):
 
     return Linked
 
+if typing.TYPE_CHECKING or _BUILDING_DOCS:
+    _LinkedDisplayDimensionsBase = LinkedType[list[str]]
+else:
+    _LinkedDisplayDimensionsBase = make_linked_navigation_type(typed_list(str), lambda x: x)
+
+@export
+class LinkedDisplayDimensions(_LinkedDisplayDimensionsBase):
+    __slots__ = ()
 
 if typing.TYPE_CHECKING or _BUILDING_DOCS:
     _LinkedPositionBase = LinkedType[np.typing.NDArray[np.float32]]
@@ -1710,6 +1718,9 @@ class LayerGroupViewer(JsonObjectWrapper):
     layers = wrapped_property("layers", typed_list(str))
     layout = wrapped_property("layout", data_panel_layout_wrapper("xy"))
     position = wrapped_property("position", LinkedPosition)
+    display_dimensions = displayDimensions = wrapped_property(
+        "displayDimensions", LinkedDisplayDimensions
+    )
     velocity = wrapped_property(
         "velocity", typed_map(key_type=str, value_type=DimensionPlaybackVelocity)
     )