Display: Support 'class' for array/struct properties #2302
Merged
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Widget classes used to only support scalar properties like X position, Width, "On" color of a binary LED.
Now classes can be used with array/struct properties like the list of symbol files for a Symbol widget or the states of a MultiStateLED.
In the class editor, the whole array can be selected to be included in the class definition
When then editing displays, selecting the class applies the complete array to the widget
Similar example: Multi state LED with states set by class
Fixes #2297