message: Simplify order_tag in TagOrderStore
  such that:
  - it takes a targetTag to be replaced instead the previous tag to insert after
  - it optionally displaces the targetTag before or after the inserted tag
diff: @@ -53,19 +53,24 @@ class TagOrderStore extends Store {
  this._setState({allTags: payload.tags});
  break;
  case 'order_tag': {
  - // Puts payload.tag below payload.prevTag in the orderedTags state
  + if (!payload.tag || !payload.targetTag || payload.tag === payload.targetTag) break;
  +
  + // Puts payload.tag at payload.targetTag, placing the targetTag before or after the tag
  const tags = SettingsStore.getValue("TagOrderStore.orderedTags") || this._state.allTags;
  +
  let orderedTags = tags.filter((t) => t !== payload.tag);
  - const tagPrevIx = orderedTags.indexOf(payload.prevTag);
  + const newIndex = orderedTags.indexOf(payload.targetTag) + (payload.after ? 1 : 0);
  orderedTags = [
  - ...orderedTags.slice(0, tagPrevIx + 1),
  + ...orderedTags.slice(0, newIndex),
  payload.tag,
  - ...orderedTags.slice(tagPrevIx + 1),
  + ...orderedTags.slice(newIndex),
  ];
  this._setState({orderedTags});
  - SettingsStore.setValue("TagOrderStore.orderedTags", null, "account", orderedTags);
  }
  break;
  + case 'commit_tags':
  + SettingsStore.setValue("TagOrderStore.orderedTags", null, "account", this._state.orderedTags);
  + break;
  }
  }
  