message: Don't show empty custom tags when filtering tags
diff: @@ -34,6 +34,7 @@ import RoomListStore from '../../../stores/RoomListStore';
  import GroupStoreCache from '../../../stores/GroupStoreCache';
  const HIDE_CONFERENCE_CHANS = true;
  +const STANDARD_TAGS_REGEX = /^(m\.(favourite|lowpriority)|im\.vector\.fake\.(invite|recent|direct|archived))$/;
  function phraseForSection(section) {
  switch (section) {
  @@ -365,7 +366,7 @@ module.exports = React.createClass({
  });
  Object.keys(lists).forEach((tagName) => {
  - filteredLists[tagName] = lists[tagName].filter((taggedRoom) => {
  + const filteredRooms = lists[tagName].filter((taggedRoom) => {
  // Somewhat impossible, but guard against it anyway
  if (!taggedRoom) {
  return;
  @@ -377,6 +378,10 @@ module.exports = React.createClass({
  return Boolean(isRoomVisible[taggedRoom.roomId]);
  });
  +
  + if (filteredRooms.length > 0 || tagName.match(STANDARD_TAGS_REGEX)) {
  + filteredLists[tagName] = filteredRooms;
  + }
  });
  return filteredLists;
  @@ -682,7 +687,7 @@ module.exports = React.createClass({
  onShowMoreRooms={self.onShowMoreRooms} />
  { Object.keys(self.state.lists).map((tagName) => {
  - if (!tagName.match(/^(m\.(favourite|lowpriority)|im\.vector\.fake\.(invite|recent|direct|archived))$/)) {
  + if (!tagName.match(STANDARD_TAGS_REGEX)) {
  return <RoomSubList list={self.state.lists[tagName]}
  key={tagName}
  label={tagName}
  