Function updateChangeset

modules/ui/commit.js:666–726

(changed, onInput)

  function updateChangeset(changed, onInput) {
    let tags = Object.assign({}, uploader.changeset.tags);   // shallow copy

    Object.keys(changed).forEach(function(k) {
      let v = changed[k];
      k = context.cleanTagKey(k);
      if (readOnlyTags.indexOf(k) !== -1) return;

      if (v === undefined) {
        delete tags[k];
      } else if (onInput) {
        tags[k] = v;
      } else {
        tags[k] = context.cleanTagValue(v);
      }
    });

    if (!onInput) {
      // when changing the comment, override hashtags with any found in comment.
      const commentOnly = changed.hasOwnProperty('comment') && (changed.comment !== '');
      const arr = findHashtags(tags, commentOnly);
      if (arr.length) {
        tags.hashtags = context.cleanTagValue(arr.join(';'));
        storage.setItem('hashtags', tags.hashtags);
      } else {
        delete tags.hashtags;
        storage.removeItem('hashtags');
      }
    }

    // always update userdetails, just in case user reauthenticates as someone else
    if (_userDetails && _userDetails.changesets_count !== undefined) {
      let changesetsCount = parseInt(_userDetails.changesets_count, 10) + 1;  // iD#4283
      tags.changesets_count = String(changesetsCount);

      // first 100 edits - new user
      if (changesetsCount <= 100) {
        let s;
        s = storage.getItem('walkthrough_completed');
        if (s) {
          tags['ideditor:walkthrough_completed'] = s;
        }

        s = storage.getItem('walkthrough_progress');
        if (s) {
          tags['ideditor:walkthrough_progress'] = s;
        }

        s = storage.getItem('walkthrough_started');
        if (s) {
          tags['ideditor:walkthrough_started'] = s;
        }
      }
    } else {
      delete tags.changesets_count;
    }

    if (!deepEqual(uploader.changeset.tags, tags)) {