message: When a `SearchableList` is focused, deselect text in the filter input.
diff: @@ -132,6 +132,9 @@ export class SearchableList<T extends { id: string; }> extends ThemeableElementB
  if (renderWork.focusInput) {
  const filterInput = <HTMLInputElement> DomUtils.getShadowId(this, ID_FILTER);
  filterInput.focus();
  + if (filterInput.selectionStart !== filterInput.selectionEnd) {
  + filterInput.selectionStart = filterInput.selectionEnd;
  + }
  }
  }
  