ShowInMenu has incorrect behavior in custom apps
In custom application, it is quite standard in only declare a subset of ParaViewFilters. However, any filters declared in ParaView with a ShowInMenu hints would still appears in their menu and in alphabetical, even when not listed as a filter of the application.
This is due to the way definitions are updated for plugins in pqProxyGroupMenuManager.
IMO, there is no reason to use ShowInMenu within ParaView and it should be used only in the context of plugins.
I will fix this by removing these ShowInMenu entries (and improving the related doc). Do you agree @utkarsh.ayachit ?