Currently the suggest widget for the property value of a class is limited to 10.
It's hard coded here: https://github.com/xwiki/xwiki-platform/blob/58e252ec8ed220e23877fc449eb2e18b47cef101/xwiki-platform-core/xwiki-platform-web/xwiki-platform-web-war/src/main/webapp/resources/uicomponents/suggest/suggestPropertyValues.js#L45
We should implement a way to configure this value and so be able to increase the suggested values.
