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It's completely non-obvious that, in a field just labelled "Filter", what you're supposed to enter is a class name. I'd expect people to try filling in the localized name of an API, or the code name of a module, but the least likely guess is that a class name will work, much less an unqualified one. Please either add instructions to the dialog explaining what to do, or change the label for the filter field to "Class Name" or something such, or preferably, both.
It's in the UI spec, but I guess that was ignored...?
Ignored is too strong. Rather forgotten ;) Thanks for the catch Tim.
Fixed. Checking in ui/customizer/AddModulePanel.java; 1.23 --> 1.24 Checking in ui/customizer/Bundle.properties; 1.57 --> 1.58
verified.