Integrate diagnostic decorations and current-source Text input boundaries

crates/oa-desktop/src/app/source_symbols.rs

@@ -126,6 +126,20 @@ impl App {
             && self.with_source_input(|input| snapshot.matches(input))
     }
 
+    /// Retained rows remain readable after departure, but are current only while
+    /// their captured source bytes still match the complete workspace.
+    pub fn source_results_current(&self) -> bool {
+        self.source_symbols
+            .results
+            .as_ref()
+            .is_some_and(|results| results.stamp.snapshot == self.source_key())
+            && self
+                .source_symbols
+                .cache
+                .as_ref()
+                .is_some_and(|cache| self.source_snapshot_matches(cache))
+    }
+
     pub fn source_navigation_available(&self) -> bool {
         self.page == Page::Text
             && !self.source_rename.open()