| This class implements a property editor for possibly null String properties
that supports custom editing (i.e.: provides a GUI component) based on a
combo box.
The provided GUI is a combo box with:
- An option for "undefined" (corresponding to the null value), unless the
noUndefined property is set.
- An option for each value in the tags property.
- The possibility to write your own value, unless the noEdit
property is set.
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