message: Add class to hide focus highlight
  We use tabIndex to make elements selectable and therefore focused by screen readers. Doing this draws a blue border (in chrome at least) around the element - in some cases, we don't want this.
diff: @@ -110,6 +110,10 @@ textarea {
  color: $primary-fg-color;
  }
  +.mx_HiddenFocusable {
  + outline: none;
  +}
  +
  // .mx_textinput is a container for a text input
  // + some other controls like buttons, ...
  // it has the appearance of a text box so the controls
  