The chartpropertiesform.xml file has a minor bug in
several places. Specifically, it indicates the type
for the background R, G and B values as 'posint', while
the titles say things like "enter Red value 0-255".
Entering the value 0 is shown as an error, because it's
not considered positive. There needs to be a type
added that is something like 'non-negative int', that
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