message: Prevent double margins when nesting gui-layouts and packed-rows
diff: align-items: baseline;
  margin-bottom: $layout-vertical-spacing;
  + & > .gui-packed-row, & > .gui-layout {
  + margin-bottom: 0px;
  + }
  +
  & > * {
  margin-left: 0.5rem;
  }
  flex-grow: 0;
  }
  }
  +
  +.gui-layout > .gui-packed-row {
  + margin-bottom: 0px;
  +}
  