eagarly clean astd maps

crates/ra_ide_api/src/change.rs

@@ -186,6 +186,7 @@ impl RootDatabase {
         if let Some(crate_graph) = change.crate_graph {
             self.set_crate_graph(Arc::new(crate_graph))
         }
+        self.collect_after_change()
     }
 
     fn apply_root_change(&mut self, root_id: SourceRootId, root_change: RootChange) {
@@ -228,4 +229,9 @@ impl RootDatabase {
         self.query(hir::db::RawItemsWithSourceMapQuery).sweep(sweep);
         self.query(hir::db::BodyWithSourceMapQuery).sweep(sweep);
     }
+
+    pub(crate) fn collect_after_change(&mut self) {
+        let sweep = SweepStrategy::default().discard_everything().sweep_all_revisions();
+        self.query(hir::db::AstIdToNodeQuery).sweep(sweep)
+    }
 }