Method _setThumbnailState

js/ui/workspaceThumbnail.js:1079–1083

(thumbnail, state)

    }

    _setThumbnailState(thumbnail, state) {
        this._stateCounts[thumbnail.state]--;
        thumbnail.state = state;
        this._stateCounts[thumbnail.state]++;
    }

    _iterateStateThumbnails(state, callback) {
        if (this._stateCounts[state] === 0)