Improve autoreload of external packages

[philippjfr]

Currently --autoreload only reloads the app itself and any one module that has changed. In practice this isn't really enough because most modules will be interconnected pretty deeply, so instead of reloading the specific module we are talking about we will reload all modules that were recorded during startup.

• Reload all modules only if they are in some other package not for relative imports from the app itself
• Fixes autoreload does not work with notebook files #6453
• Add more tests

[codecov]

Codecov Report

Attention: Patch coverage is 46.83258% with 235 lines in your changes are missing coverage. Please review.

Project coverage is 71.45%. Comparing base (2a2af56) to head (04bbbf6).

Files	Patch %	Lines
panel/io/handlers.py	24.83%	115 Missing ⚠️
panel/tests/ui/io/test_reload.py	31.37%	35 Missing ⚠️
panel/io/reload.py	46.03%	34 Missing ⚠️
panel/tests/conftest.py	48.71%	20 Missing ⚠️
panel/io/server.py	46.66%	16 Missing ⚠️
panel/io/application.py	83.05%	10 Missing ⚠️
panel/tests/ui/io/app.py	0.00%	2 Missing ⚠️
panel/command/serve.py	0.00%	1 Missing ⚠️
panel/io/document.py	95.65%	1 Missing ⚠️
panel/io/jupyter_executor.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #6459       +/-   ##
===========================================
- Coverage   82.13%   71.45%   -10.68%     
===========================================
  Files         312      314        +2     
  Lines       46122    46309      +187     
===========================================
- Hits        37881    33091     -4790     
- Misses       8241    13218     +4977     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	71.45% <46.83%> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[hoxbro]

I have looked at the code. I still want to test it out, but I left some comments.

I don't think we should use Pathlib for this low-level stuff. There is a time penalty for creating each of the objects. I have tried to update some, but please check.

[hoxbro]

Is it ok to raise an error now for this?

[philippjfr]

Not quite following.

[hoxbro]

The lines above, was wrapped in try/except.

        for thread in self._threads.values():
            try:
                thread.stop()
            except Exception:
                pass

[philippjfr]

Thanks for the review, I'll wait for tests to pass and then apply your suggestions.

[hoxbro]

I just did (light) some testing of the PR, and it seems to work as promised 👍