class_docstr: title collector for sphinx.environment.
class_docstr_tok: ["title","collector","for","sphinx.environment","."]
code: def merge_other(
      self,
      app: Sphinx,
      env: BuildEnvironment,
      docnames: set[str],
      other: BuildEnvironment,
  ) -> None:
      for docname in docnames:
          env.titles[docname] = other.titles[docname]
          env.longtitles[docname] = other.longtitles[docname]
  
file_path: sphinx/sphinx/environment/collectors/title.py
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, Any
  from docutils import nodes
  from sphinx.environment.collectors import EnvironmentCollector
  from sphinx.transforms import SphinxContentsFilter
label_desc: Use image node_id 2 for calling the TitleCollector obj's underlying member method code with example usage: obj.merge_other(app, env, docnames, other) without return types