Prevent stale cross-bucket rows during source-tab switches

static/sessions.js

@@ -1658,6 +1658,7 @@ function _setSessionSourceFilter(filter) {
   _selectedSessions.clear();
   _sessionSelectMode = false;
   try { localStorage.setItem('hermes-session-source-filter', next); } catch (_e) {}
+  renderSessionListFromCache();
   void renderSessionList({deferWhileInteracting:false});
 }
 

tests/test_issue4766_sidebar_source_pushdown.py

@@ -286,6 +286,9 @@ global.localStorage = {{
     this.writes.push([key, value]);
   }},
 }};
+global.renderSessionListFromCache = () => {{
+  renderCalls.push('cache');
+}};
 global.renderSessionList = (opts) => {{
   renderCalls.push(opts);
   return Promise.resolve();
@@ -308,7 +311,7 @@ console.log(JSON.stringify({{
     assert body["selectedSize"] == 0
     assert body["sessionSelectMode"] is False
     assert body["storageWrites"] == [["hermes-session-source-filter", "cli"]]
-    assert body["renderCalls"] == [{"deferWhileInteracting": False}]
+    assert body["renderCalls"] == ["cache", {"deferWhileInteracting": False}]
 
 
 @pytest.mark.skipif(NODE is None, reason="node not on PATH")