no need for a global map!

plugin/core/sessions.py

@@ -667,12 +667,6 @@ def on_session_end_async(self) -> None:
 
 
 _plugins = {}  # type: Dict[str, Tuple[Type[AbstractPlugin], SettingsRegistration]]
-_pending_uris_to_set = {}  # type: Dict[str, DocumentUri]
-
-
-def get_possible_uri_to_set(title: str) -> Optional[str]:
-    global _pending_uris_to_set
-    return _pending_uris_to_set.get(title)
 
 
 def _register_plugin_impl(plugin: Type[AbstractPlugin], notify_listener: bool) -> None:
@@ -1138,9 +1132,10 @@ def open_uri_async(
                 result = Promise.packaged_task()  # type: PackagedTask[bool]
 
                 def open_scratch_buffer(title: str, content: str, syntax: str) -> None:
-                    global _pending_uris_to_set
-                    _pending_uris_to_set[title] = uri
                     v = self.window.new_file(syntax=syntax, flags=flags)
+                    # Note: the __init__ of ViewEventListeners is invoked in the next UI frame, so we can fill in the
+                    # settings object here at our leisure.
+                    v.settings().set("lsp_uri", uri)
                     v.set_scratch(True)
                     v.set_name(title)
                     v.run_command("append", {"characters": content})

plugin/core/url.py

@@ -1,4 +1,4 @@
-from .typing import Any, Optional
+from .typing import Any
 from urllib.parse import quote
 from urllib.parse import urljoin
 from urllib.parse import urlparse
@@ -25,9 +25,7 @@ def filename_to_uri(file_name: str) -> str:
     return urljoin("file:", path)
 
 
-def view_to_uri(view: sublime.View, foreign_uri: Optional[str] = None) -> str:
-    if isinstance(foreign_uri, str):
-        return foreign_uri
+def view_to_uri(view: sublime.View) -> str:
     file_name = view.file_name()
     if not file_name:
         return "buffer://sublime/{}".format(view.buffer_id())

plugin/documents.py

@@ -13,7 +13,6 @@
 from .core.protocol import SignatureHelp
 from .core.registry import best_session
 from .core.registry import windows
-from .core.sessions import get_possible_uri_to_set
 from .core.sessions import Session
 from .core.settings import userprefs
 from .core.signature_help import SigHelp
@@ -154,7 +153,11 @@ def on_change() -> None:
                 this._on_settings_object_changed()
 
         self._current_syntax = None
-        self.set_uri(view_to_uri(view, get_possible_uri_to_set(view.name())))
+        foreign_uri = view.settings().get("lsp_uri")
+        if isinstance(foreign_uri, str):
+            self._uri = foreign_uri
+        else:
+            self.set_uri(view_to_uri(view))
         self._registration = SettingsRegistration(view.settings(), on_change=on_change)
         self._setup()