code: function isFileBeingEdited(filePath) {
          var currentEditor   = EditorManager.getActiveEditor(),
              currentDoc      = currentEditor && currentEditor.document;
  
          return (currentDoc && currentDoc.file.fullPath === filePath);
      }
docs: Test if the file path is in current editor
  
  @param {string} filePath file path to test for exclusion.
  @return {boolean} true if in editor, false otherwise.