From a1188f3152f36d5a5f688b1317d9f27b716dca85 Mon Sep 17 00:00:00 2001
From: Rafal Chlodnicki <rchl2k@gmail.com>
Date: Sat, 16 Oct 2021 21:23:28 +0200
Subject: [PATCH 1/3] Add AbstractPlugin.on_session_buffer_changed API

---
 plugin/core/sessions.py  | 10 ++++++++++
 plugin/session_buffer.py |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/plugin/core/sessions.py b/plugin/core/sessions.py
index b8710db12..a8321a294 100644
--- a/plugin/core/sessions.py
+++ b/plugin/core/sessions.py
@@ -672,6 +672,12 @@ def on_open_uri_async(self, uri: DocumentUri, callback: Callable[[str, str, str]
         """
         return False
 
+    def on_session_buffer_changed(self, session_buffer: SessionBufferProtocol) -> None:
+        """
+        Called when the context of the session buffer is changed or a new buffer is opened.
+        """
+        pass
+
     def on_session_end_async(self) -> None:
         """
         Notifies about the session ending (also if the session has crashed). Provides an opportunity to clean up
@@ -1253,6 +1259,10 @@ def open_location_async(self, location: Union[Location, LocationLink], flags: in
         uri, r = get_uri_and_range_from_location(location)
         return self.open_uri_async(uri, r, flags, group)
 
+    def notify_plugin_on_session_buffer_change(self, session_buffer: SessionBufferProtocol) -> None:
+        if self._plugin:
+            self._plugin.on_session_buffer_changed(session_buffer)
+
     def _maybe_resolve_code_action(self, code_action: CodeAction) -> Promise[Union[CodeAction, Error]]:
         if "edit" not in code_action and self.has_capability("codeActionProvider.resolveProvider"):
             # TODO: Should we accept a SessionBuffer? What if this capability is registered with a documentSelector?
diff --git a/plugin/session_buffer.py b/plugin/session_buffer.py
index b08e84ebb..29ca21b8e 100644
--- a/plugin/session_buffer.py
+++ b/plugin/session_buffer.py
@@ -105,6 +105,7 @@ def _check_did_open(self, view: sublime.View) -> None:
                 return
             self.session.send_notification(did_open(view, language_id))
             self.opened = True
+            self.session.notify_plugin_on_session_buffer_change(self)
 
     def _check_did_close(self) -> None:
         if self.opened and self.should_notify_did_close():
@@ -238,6 +239,7 @@ def purge_changes_async(self, view: sublime.View) -> None:
             except MissingUriError:
                 pass  # we're closing
             self.pending_changes = None
+            self.session.notify_plugin_on_session_buffer_change(self)
 
     def on_pre_save_async(self, view: sublime.View) -> None:
         if self.should_notify_will_save():

From 864fcab498495ff246042a60c294bf43918eb3e1 Mon Sep 17 00:00:00 2001
From: Rafal Chlodnicki <rchl2k@gmail.com>
Date: Sat, 16 Oct 2021 22:25:43 +0200
Subject: [PATCH 2/3] _async

---
 plugin/core/sessions.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/plugin/core/sessions.py b/plugin/core/sessions.py
index a8321a294..d1afb6b7c 100644
--- a/plugin/core/sessions.py
+++ b/plugin/core/sessions.py
@@ -672,7 +672,7 @@ def on_open_uri_async(self, uri: DocumentUri, callback: Callable[[str, str, str]
         """
         return False
 
-    def on_session_buffer_changed(self, session_buffer: SessionBufferProtocol) -> None:
+    def on_session_buffer_changed_async(self, session_buffer: SessionBufferProtocol) -> None:
         """
         Called when the context of the session buffer is changed or a new buffer is opened.
         """
@@ -1261,7 +1261,7 @@ def open_location_async(self, location: Union[Location, LocationLink], flags: in
 
     def notify_plugin_on_session_buffer_change(self, session_buffer: SessionBufferProtocol) -> None:
         if self._plugin:
-            self._plugin.on_session_buffer_changed(session_buffer)
+            self._plugin.on_session_buffer_changed_async(session_buffer)
 
     def _maybe_resolve_code_action(self, code_action: CodeAction) -> Promise[Union[CodeAction, Error]]:
         if "edit" not in code_action and self.has_capability("codeActionProvider.resolveProvider"):

From 1efe5c196260b796428711619254983c180c1f8e Mon Sep 17 00:00:00 2001
From: Rafal Chlodnicki <rchl2k@gmail.com>
Date: Sat, 16 Oct 2021 22:26:50 +0200
Subject: [PATCH 3/3] has/was

---
 plugin/core/sessions.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugin/core/sessions.py b/plugin/core/sessions.py
index d1afb6b7c..3dec33eeb 100644
--- a/plugin/core/sessions.py
+++ b/plugin/core/sessions.py
@@ -674,7 +674,7 @@ def on_open_uri_async(self, uri: DocumentUri, callback: Callable[[str, str, str]
 
     def on_session_buffer_changed_async(self, session_buffer: SessionBufferProtocol) -> None:
         """
-        Called when the context of the session buffer is changed or a new buffer is opened.
+        Called when the context of the session buffer has changed or a new buffer was opened.
         """
         pass