message: use elementLabel() for sequence widget dropdown
diff: @@ -20,6 +20,8 @@ import { HeteroSequenceWrapper } from './sequence/hetero';
  import { State, StateSelection } from '../../mol-state';
  import { ChainSequenceWrapper } from './sequence/chain';
  import { ElementSequenceWrapper } from './sequence/element';
  +import { elementLabel } from '../../mol-theme/label';
  +import { stripTags } from '../../mol-util/string';
  const MaxDisplaySequenceLength = 5000
  @@ -123,12 +125,7 @@ function getUnitOptions(structure: Structure, modelEntityId: string) {
  // TODO handle special cases
  // - more than one chain in a unit
  // - chain spread over multiple units
  - let label = ''
  - if (Unit.isAtomic(unit)) {
  - label = `${SP.chain.label_asym_id(l)}: ${SP.chain.auth_asym_id(l)}`
  - } else {
  - label = `${SP.coarse.asym_id(l)}`
  - }
  + let label = stripTags(elementLabel(l, 'chain', true))
  if (SP.entity.type(l) === 'water') {
  const count = water.get(label) || 1
  water.set(label, count + 1)
  