Several changes:

    - Fix WMenuItem setting custom link being overridden by menu internal path (#3460)
    - Make focussing a generic widget property (not specific to WFormWidget), #3424
    - fix Undefined reference to item.set in StdGridLayoutImpl2.js (#3445, Bruce Toll)
    - Fix storage of NaN in sqlite3 (#3446)
    - Fix rendering glitch of WTree in polished theme on chrome with non-100% zoom level (#3525)
    - Added WPieChart::setLabelFormat (#3533)
Severa changes:

    - fix XSS vulnerability caused by leading space
    - fix nested popup widget cancelling as well as not correctly calling render() of stubbed WCompositeWidget (#3242)
    - make WStandardItemModel robust against header data requests outside geometry (#2408)
    - added missing icon files (#2312)
    - fixed setting text later on checkbox (#2293)
    - fix tooltip not showing when wrapped inside a button (#2256)
    - allow non-modal dialog to raise to front using titlebar click (#2167)
    - document limitation of WDialog::exec() + non-event thread (#976)
Merge remote-tracking branch 'upstream/master'