fix(clojure): declare didChangeWatchedFiles client capability

Serena notifies language servers about files changed outside its own edit tools (a git checkout, another editor, a build step) by sending workspace/didChangeWatchedFiles from LanguageServerManager.poll_and_notify, whose docstring names this exact case: such edits are 'otherwise invisible to a warm language server, causing symbolic queries to answer from a stale index'.

ClojureLSP never declared the corresponding client capability, so clojure-lsp was not told those notifications are sent and need not treat them as a reason to invalidate its analysis. DefaultInitializeParamsBuilder does not supply a default capabilities block, so nothing filled this in on the server's behalf.

Relates to #1593, where find_symbol returned a body from a comment mentioning the symbol rather than its definition, at a position the symbol had previously occupied.

test/solidlsp/clojure/test_clojure_initialize_params.py

@@ -0,0 +1,42 @@
+import pytest
+
+from solidlsp.language_servers.clojure_lsp import ClojureLSP
+
+pytestmark = pytest.mark.clojure
+
+
+def _make_server(monkeypatch: pytest.MonkeyPatch) -> ClojureLSP:
+    """Build a ClojureLSP without running __init__ (no clojure-lsp binary needed)."""
+    server = object.__new__(ClojureLSP)
+    monkeypatch.setattr(ClojureLSP, "_resolve_source_paths", lambda _self: None)
+    return server
+
+
+def test_declares_did_change_watched_files_capability(monkeypatch: pytest.MonkeyPatch) -> None:
+    """clojure-lsp must announce that the client sends workspace/didChangeWatchedFiles.
+
+    Serena notifies language servers about files changed outside its own edit tools
+    (git checkout, another editor, a build step) via that notification
+    (LanguageServerManager.poll_and_notify). A server that was never told the client
+    supports it may keep answering symbol queries from its own stale analysis, which
+    surfaces as find_symbol returning a body from the wrong location.
+    """
+    params = _make_server(monkeypatch)._create_base_initialize_params()
+
+    workspace = params["capabilities"]["workspace"]
+    assert "didChangeWatchedFiles" in workspace, (
+        "clojure-lsp does not declare the didChangeWatchedFiles client capability, so external file changes may not invalidate its analysis"
+    )
+    assert workspace["didChangeWatchedFiles"]["dynamicRegistration"] is True
+
+
+def test_base_initialize_params_keep_existing_workspace_capabilities(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """The added capability must not displace the ones already relied upon."""
+    workspace = _make_server(monkeypatch)._create_base_initialize_params()["capabilities"]["workspace"]
+
+    assert workspace["applyEdit"] is True
+    assert workspace["workspaceEdit"] == {"documentChanges": True}
+    assert workspace["workspaceFolders"] is True
+    assert workspace["symbol"]["symbolKind"]["valueSet"] == list(range(1, 27))