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• I have tested the web viewer

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is that correct though? Sounds like with that everything becomes an import and we never open a new recording. Or does something already switch to a new recording for mcap? In that case plz document that & why at the changed callsite

This avoids everything being a new recording. When loading in a file programmatically (e.g. using load_file_from_path like in the snippet in #11027), we expect it to load the mcap file into the recording that we've created using rr.init.

This changes the behavior slightly;

• when dragging an mcap file into the viewer, it will create a new recording for that file, unless there's a recording that's already open.
• when loading an mcap file using the cli, it will create a new recording regardless of whether there's one open already.
• when calling load_file_from_path it will respect the open recording instead of always creating a new recording.

thank, I think that makes sense