So in short i think it would be great if the following feature is included in next release of SQL Developer
- Connections to display as in groups
You're a little bit late with that suggestion - the feature has been available for quite some time.
Right-click on a connection and select 'Add to Folder -> New Folder...' from the pop-up menu. Then create the folder you want to put the connection in.
So go ahead and put your connections in folders: Prod, Testing, Staging, etc.
I think the poster means this actually
You'll need to be more specific. The developer comment for the feature request you linked says this:
Folders in the navigator are currently not persisted. Implementing this is not trivial.
I have created 'prod' and 'test' folders and put connections in each of them in 3.0.02 Build MAIN-02.37 and the folders and connections persist just fine.
So the connections themselves can certainly be 'grouped' which is what OP specifically asked about.
What if there is Group by option in the drop down so that we can customize or group lower environment connections in one place and others in different group, even color coding of critical connections settings could be much helpful.
Everything else in the tree (e.g. schemas) is specific to a connection which can be specific to a user created folder such as 'prod' or 'test'.
So if OP means something else they will need to clarify what they really mean and provide an example.