Opening rrd file with same application id as current one does not work

[roym899]

Describe the bug
When trying to load a different rrd file with the same application_id as the current one, nothing happens. (both by drag and drop, and by using the load dialog).

Opening from the terminal starts a separate Rerun instance, which I think is good.

To Reproduce
Create two rrd files

import rerun as rr
import numpy as np
import time

rr.init("test", spawn=True)

rr.save("test1.rrd")
rr.log("image", rr.Image(0.3 * np.random.rand(100,100,3)))

time.sleep(5.0)

rr.save("test2.rrd")
rr.log("image", rr.Image(np.random.rand(100,100,3)))

Drag and drop one of the two files into the viewer (rrd file shows up).
Drag and drop the other file into the viewer (-> nothing changes).

Expected behavior
Open the new rrd file. Showing both in the list of recent recordings.

Rerun version

rerun_py 0.10.0-alpha.7+dev [rustc 1.72.1 (d5c2e9c34 2023-09-13), LLVM 16.0.5] x86_64-unknown-linux-gnu main 47414c8, built 2023-10-24T12:00:38Z

[nikolausWest]

This is probably due to:

• Defaulting the RecordingId to authkey() should be opt-in #3793

tldr: Both rrd files actually have the same application id and recording id because in Python, recording id is set to authkey() by default which is random but constant per process