Coverity: Use after free in Qt Designer's property editor

qttools/src/designer/src/components/propertyeditor/designerpropertymanager.cpp
has multiple occurrences of code like:

QtProperty *alignV = m_propertyToAlignV.value(property);
    if (alignV) {
        delete alignV;
        m_alignVToProperty.remove(alignV);
    }

which triggers a coverity warning about use after free (sort-of semi-false positive).