DynamicTreeContentProviderBase::filter() should be case insensitive
DynamicTreeContentProviderBase::filter() should be case insensitive to enable more intuitive searching of trees.
The following subclasses that override filter() have to be considered explicity:
- DataDictionaryFXEditorContentProvider
- ModelElementsViewFX.ContentProvider
RequirementsOverviewFXEditorContentProvider already implements case insensitive behaviour.
(from redmine: issue id 3953, created on 2020-03-17, closed on 2020-03-26)