message: Work around atlassian/react-beautiful-dnd#273
  For some reason, after dragging an item
  the parent draggable receives a mouse click. The workaround is
  to use onMouseDown for deselecting tags
diff: @@ -111,13 +111,14 @@ const TagPanel = React.createClass({
  selected={this.state.selectedTags.includes(tag)}
  />;
  });
  - return <div className="mx_TagPanel" onClick={this.onClick}>
  + return <div className="mx_TagPanel">
  <DragDropContext onDragEnd={this.onTagTileEndDrag}>
  <Droppable droppableId="tag-panel-droppable">
  { (provided, snapshot) => (
  <div
  className="mx_TagPanel_tagTileContainer"
  ref={provided.innerRef}
  + onMouseDown={this.onClick}
  >
  { tags }
  { provided.placeholder }
  