message: Fix delete popover stacking issue.
diff: @apps__trigger-row-height: 40px;
  @apps__trigger-border-width--empty: 3px;
  +
  +/*
  +README!!
  +// Group of flows
  +// z-indexes inside the flow-group context
  +// 0: default flow card
  +// 1: hovered flow card
  +// 2: new flow button/delete popover
  +**/
  +
  .flogo-group {
  margin-top: 12px;
  margin-bottom: @apps__trigger-row-height;
  - // create as stacking context so we can reorder the elements inside
  - position: relative;
  - z-index: 0;
  }
  .flogo-group__trigger {
  width: 56px;
  float: left;
  - z-index: 1;
  + z-index: 2;
  }
  -// Group of flows
  -// z-indexes inside the flow-group context
  -// 0: default flow card
  -// 1: hovered flow card
  -// 2: new flow button
  .flogo-group__flows {
  width: 94%;
  float: left;
  margin-left: -16px;
  -
  - position: relative;
  - z-index: 0;
  }
  .flogo-icon-add {
  