Values for default color properties of selected QML items aren't correct and get modified if set

Steps to reproduce:

• open/create Qt Quick 2 Application (used the template from New Project wizard)
• switch to Designer
• select a QML item with color property and check
• get back to Edit mode, add the color property to one of the items and set a value (I've set color: "red" for the Text element)
• switch back to Designer - if color of the Text is displayed correctly switch to Rectangle inside Navigator and back to Text (maybe necessary to perform this twice)

Current behavior:

• all default color values are set to #000000 no matter what the correct value is
• some set colors are displayed wrong ("green" is displayed inside Designer as "#038000" if you switch back to Edit it's displayed as "#028000", "lightblue" is "#add8e6" (Designer) and "#add9e6" (Edit))
• some colors get modified by the Designer (the mentioned "red" was changed by Designer to "#808080", "darkred" to "#454545")
• setting a color with Designer and switching afterwards between the QML items and back to the modified item changes the color value slightly to a different value (in most cases the modified value now stays when switching again between the items and back)