release3_4.js

mergeProps (state, ownProps) {
    const currentWindow = state.get('currentWindow')
    const tabId = ownProps.tabId
    const frameKey = frameStateUtil.getFrameKeyByTabId(currentWindow, tabId)

    const props = {}
    props.isPinned = tabState.isTabPinned(state, tabId)
    props.showTabTitle = titleState.showTabTitle(currentWindow, frameKey)
    
    ....
    }