Resolve more review comments in sphinx-doc#12162

Signed-off-by: Donald Hunter <[email protected]>

Author: donaldh

sphinx/domains/c/_symbol.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Any, Callable
+from typing import TYPE_CHECKING, Any, Callable, ValuesView
 
 from sphinx.domains.c._ast import (
     ASTDeclaration,
@@ -117,8 +117,8 @@ def __init__(
         self._add_function_params()
 
     @property
-    def _children(self) -> Sequence[Symbol]:
-        return list(self._childrenByName.values())
+    def _children(self) -> ValuesView[Symbol]:
+        return self._childrenByName.values()
 
     def _add_child(self, child: Symbol) -> None:
         name = child.ident.name
@@ -134,7 +134,7 @@ def _remove_child(self, child: Symbol) -> None:
         self._childrenByName.pop(name)
         siblings = self._childrenByDocname.get(child.docname, {})
         if name in siblings:
-            siblings.pop(name)
+            del siblings[name]
         if child.ident.is_anon() and child in self._anonChildren:
             self._anonChildren.remove(child)
 
@@ -187,7 +187,9 @@ def clear_doc(self, docname: str) -> None:
             for child in self._children:
                 child.clear_doc(docname)
             return
-        for sChild in self._childrenByDocname[docname].values():
+
+        children: dict[str, Symbol] = self._childrenByDocname.pop(docname)
+        for sChild in children.values():
             sChild.declaration = None
             sChild.docname = None
             sChild.line = None
@@ -197,9 +199,7 @@ def clear_doc(self, docname: str) -> None:
                 sChild.siblingBelow.siblingAbove = sChild.siblingAbove
             sChild.siblingAbove = None
             sChild.siblingBelow = None
-
             self._remove_child(sChild)
-        del self._childrenByDocname[docname]
 
     def get_all_symbols(self) -> Iterator[Symbol]:
         yield self