JetBrainsFindSymbolTool: Force search_deps=True if relative path to ext. file

Improve changelog entry

CHANGELOG.md

@@ -7,7 +7,10 @@ Status of the `main` branch. Changes prior to the next official version change w
   - Extended the list of always ignored directories (by language servers) with common cases.
 
 JetBrains: 
-  - Minor fixes in handling `relative_path` for external dependencies.
+  - Improve handling of `relative_path` parameter 
+     - Improve its documentation to avoid usage errors
+     - Replace escaped characters in `relative_path` with their unescaped counterparts (< and >)
+     - `FindSymbolTool`: Force `search_deps=True` if `relative_path` pertains to external dependencies.
 
 * Language Servers:
   - Add mSL (mIRC Scripting Language) support (custom pygls-based language server; symbols, references, definitions)

src/serena/tools/jetbrains_tools.py

@@ -74,11 +74,15 @@ class JetBrainsFindSymbolTool(Tool, ToolMarkerSymbolicRead, ToolMarkerOptional):
             depth = 0  # ignore user-specified depth if body is requested
 
         name_path_pattern = self._sanitize_input_param(name_path_pattern)
+
         if relative_path:
             relative_path = self._sanitize_input_param(relative_path)
-
         if relative_path == ".":
             relative_path = None
+
+        if relative_path is not None and relative_path.startswith(jb.JB_EXTERNAL_FILE_PREFIX):
+            search_deps = True
+
         with JetBrainsPluginClient.from_project(self.project) as client:
             if include_body:
                 include_quick_info = False