many changes related to #1192:

- use CSS contain wherever possible to reduce subtrees of forced reflows
- reduced dependency between note and note_contents updates which will reduce number of updates to components
- optimization of "many rows" querying

src/routes/api/notes.js

@@ -23,6 +23,11 @@ function getNote(req) {
         }
     }
 
+    const contentMetadata = note.getContentMetadata();
+
+    note.combinedUtcDateModified = note.utcDateModified > contentMetadata.utcDateModified ? note.utcDateModified : contentMetadata.utcDateModified;
+    note.combinedDateModified = note.utcDateModified > contentMetadata.utcDateModified ? note.dateModified : contentMetadata.dateModified;
+
     return note;
 }