feat(lsp): support Java class file contents and improve definition navigation handling

- Add `_lsp_java_class_file_contents` request to fetch contents of compiled Java classes via LSP (`java/classFileContents`).
- Handle `java/classFileContents` responses by opening a new buffer with Java syntax highlighting and inserting the returned source.
- Update definition handling to pass URI and range, enabling precise cursor placement after navigation.
- Detect `jdt://` URIs in `textDocument/definition` responses and request class file contents instead of direct navigation.
- Move goto navigation logic into `LSPServerEventsMixin`, using event system to access the active view and position the cursor.
- Expose `emit` and `emit_to` to the response cache for event dispatching.
- Restrict completion activation to `USER_REQUESTED`.
- Add TODO note about mapping language IDs to dedicated response handlers.

plugins/code/ui/lsp_manager/mixins/lsp_server_events_mixin.py

@@ -3,18 +3,20 @@
 # Lib imports
 import gi
 
+gi.require_version('GtkSource', '4')
+
 from gi.repository import GLib
+from gi.repository import GtkSource
 
 # Application imports
-from libs.event_factory import Code_Event_Types
+from libs.event_factory import Event_Factory, Code_Event_Types
 
 
 
 class LSPServerEventsMixin:
 
-    def _handle_definition_response(self, result: dict or list):
-        if not result: return
-        self._prompt_goto_request(result[0]["uri"])
+    def _handle_definition_response(self, uri: str, pointer_pos: dict):
+        self._prompt_goto_request(uri, pointer_pos)
 
     def _handle_completion_response(self, result: dict or list):
         if not result: return
@@ -52,8 +54,38 @@ class LSPServerEventsMixin:
 
         self._prompt_completion_request()
 
-    def _prompt_completion_request(self):
-        raise NotImplementedError
 
-    def _prompt_goto_request(self, uri: str):
-        raise NotImplementedError
+    def _prompt_goto_request(self, uri: str, pointer_pos: dict):
+        event  = Event_Factory.create_event(
+            "get_active_view",
+        )
+        self.emit_to("source_views", event)
+        view = event.response
+        view._on_uri_data_received( [uri] )
+
+        buffer = view.get_buffer()
+
+        def move_cursor(buffer, pointer_pos):
+            itr = buffer.get_iter_at_line( pointer_pos["end"]["line"] )
+            itr.forward_chars( pointer_pos["end"]["character"] )
+            buffer.place_cursor(itr)
+            view.scroll_to_iter(itr, 0.2, False, 0, 0)
+
+        GLib.idle_add( move_cursor, buffer, pointer_pos )
+
+    def _handle_java_class_file_contents(self, text: str):
+        event  = Event_Factory.create_event(
+            "get_active_view",
+        )
+        self.emit_to("source_views", event)
+
+        view       = event.response
+        file       = view.command.exec("new_file")
+        buffer     = view.get_buffer()
+        itr        = buffer.get_iter_at_mark( buffer.get_insert() )
+        lm         = GtkSource.LanguageManager.get_default()
+        language   = lm.get_language("java")
+        file.ftype = "java"
+
+        buffer.set_language(language)
+        buffer.insert(itr, text, -1)