mypy: add gstate_protect/unprotect

python_payload/mypystubs/ctx.pyi

@@ -75,6 +75,20 @@ class Context(Protocol):
         should be balanced.
         """
         pass
+    def gstate_protect(self) -> "Context":
+        """
+        Marks the current depth of the graphics state as a floor, after this
+        call it is not possible to restore() beyond this level. The protection
+        is lifted with gstate_unprotect.
+        """
+        pass
+    def gstate_unprotect(self) -> "Context":
+        """
+        Removes gstate_unprotect, if insufficient restore() calls have been made
+        since gstate_protect, a warning is printed and implicit restore calls
+        made.
+        """
+        pass
     def start_group(self) -> "Context":
         """
         Start a compositing group.