message: Consistent popover size
diff: @@ -285,12 +285,15 @@ export default class MessageComposer extends React.Component {
  // Stickers
  if (this.state.showStickers) {
  + const popoverWidth = '300px';
  + const popoverHeight = '300px';
  const stickerpackWidget = Widgets.getStickerpackWidgets()[0];
  let stickersContent = <p>Click here to add your first sitckerpack</p>;
  if (stickerpackWidget && stickerpackWidget.content && stickerpackWidget.content.url) {
  stickersContent = <div style={{
  border: 'none',
  - height: '160px',
  + height: popoverHeight,
  + width: popoverWidth,
  }}>
  <AppTile
  id={stickerpackWidget.id}
  @@ -327,10 +330,10 @@ export default class MessageComposer extends React.Component {
  }}
  style={{
  borderRadius: '5px',
  - width: 'initial',
  padding: 0,
  overflow: 'hidden',
  - height: '160px',
  + height: popoverHeight,
  + width: popoverWidth,
  }}
  children={stickersContent}
  />
  