empty viewport, prevent duplicate series meta from add, protect broadcast events when no data has changed

platform/viewer/src/state/ViewportGridProvider.js

@@ -1,37 +0,0 @@
-import React, { useState, createContext, useContext } from 'react';
-import PropTypes from 'prop-types';
-
-const ViewportGridContext = createContext(null);
-
-export const useViewportGrid = () => useContext(ViewportGridContext);
-
-export default function ViewportGridProvider({ children }) {
-  const [viewportGrid, setViewportGrid] = useState({
-    rows: 1,
-    columns: 1,
-    viewports: [],
-  });
-
-  const get = () => {
-    return viewportGrid;
-  };
-
-  const set = ({ rows, columns, viewports }) => {
-    setViewportGrid({ rows, columns, viewports });
-  };
-
-  return (
-    <ViewportGridProvider.Provider value={{ get, set }}>
-      {/* {children} */}
-    </ViewportGridProvider.Provider>
-  );
-}
-
-ViewportGridProvider.propTypes = {
-  children: PropTypes.oneOfType([
-    PropTypes.arrayOf(PropTypes.node),
-    PropTypes.node,
-  ]).isRequired,
-};
-
-export default ViewportGridProvider;