First, I like the changes in this PR. Instead of re-sending a canceled shutdown request, now the code does not cancel the request, and it looks much more logical than before.

With this, I do not fully understand the origin of the problem in issue #7177. The log that I see looks ok to me, and the code behaves as expected:

[PID:605050] 2022-11-16 14:34:37,316 - INFO - CoreManager(187) - Stopping Core manager
[PID:605050] 2022-11-16 14:34:37,317 - INFO - CoreManager(203) - Sending shutdown request to Tribler Core
[PID:605050] 2022-11-16 14:34:37,320 - WARNING - root(252) - Request from GUI to Core was canceled: http://localhost:52195/shutdown
[PID:605050] 2022-11-16 14:34:37,321 - WARNING - CoreManager(205) - Re-sending shutdown request to Tribler Core

The shutdown request was canceled, and then it was re-sent again. It looks contrived but should work, so the log lines look as expected.

But are these the last lines of the log file? Then it is strange. If the shutdown request was not re-sent properly, I expect additional lines in the log, at least from the working Core.

And, if Core ignored the re-sent shutdown request, then the problem may be on the Core side.

So, if we have a problem with the shutdown, I'm not sure these changes should fix it, but the code definitely looks better than before.