message: Clip children to bounds of FlowView's root div
diff: @@ -3451,8 +3451,12 @@ export class FlowView extends ui.Component {
  // https://www.w3.org/WAI/GL/WCAG20/WD-WCAG20-TECHS/SCR29.html
  this.element.tabIndex = 0;
  + // Disable visible focus outline when FlowView is focused.
  this.element.style.outline = "0px solid transparent";
  + // Clip children of FlowView to the bounds of the FlowView's root div.
  + this.element.style.overflow = "hidden";
  +
  this.cmdTree = new MergeTree.TST<ICmd>();
  for (const command of commands) {
  this.cmdTree.put(command.key.toLowerCase(), command);
  