message: support disabled state for pf-m-plain dropdown
diff: @@ -101,10 +101,13 @@ $dropdown-background--hover: $color-pf-black-200; // pf-c-dropdown__menu-item--h
  max-width: 60%;
  .pf-c-dropdown__toggle.pf-m-plain {
  - color: initial;
  font-size: ($font-size-base + 1);
  padding: 2px 0 !important;
  + &:not(:disabled) {
  + color: inherit;
  + }
  +
  @media (min-width: $grid-float-breakpoint) {
  font-size: ($font-size-base + 2);
  padding-bottom: 9px !important;
  