Run by line test is not stopping at end of cell

[rchiodo]

This test:

'Stops at end of cell'

is failing because run by line is running without stopping. After the first run by line command this happens:

This breaks the rest of the test.

[rchiodo]

Test should probably be rewritten to have second line change the value of A to verify it's stepping one line at a time.

[amunger]

Still one of our flakiest tests, but possibly a different issue. In failure cases, we can see in the logs a disconnect message is sent, but we no longer hear anything on the debug channel as it waits for 60 seconds:

2022-08-08T18:21:12.1770280Z info 18:21:12.125:  willSendRequest: disconnect
2022-08-08T18:21:12.1784097Z verbose 18:21:12.125:  [Debug] to kernel: {"command":"disconnect","arguments":{"restart":false},"type":"request","seq":40}
2022-08-08T18:21:12.1991226Z info 18:21:12.147:  �[32mWidget Coordinator received IPyWidgets_iopub_msg_handled
2022-08-08T18:21:12.1997064Z info 18:21:12.149:  �[32mWidget Coordinator received IPyWidgets_msg_received
2022-08-08T18:21:12.2001149Z info 18:21:12.160:  �[32mWidget Coordinator received IPyWidgets_msg_received
2022-08-08T18:21:12.2010255Z info 18:21:12.165:  �[32mWidget Coordinator received IPyWidgets_iopub_msg_handled
2022-08-08T18:21:12.2161233Z info 18:21:12.177:  Getting active debug session, emptyPython3299d122-8ea8-4fcb-9dda-e47f1a722c90..ipynb
2022-08-08T18:21:12.2165045Z info 18:21:12.177:  Getting active debug session, emptyPython3299d122-8ea8-4fcb-9dda-e47f1a722c90..ipynb
2022-08-08T18:21:12.3698778Z [3878:0808/182112.369305:ERROR:bus.cc(398)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix")
2022-08-08T18:21:12.3714601Z [3878:0808/182112.371084:ERROR:bus.cc(398)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix")
2022-08-08T18:22:11.9537515Z Test failing --- DebugSession should end

whereas successful runs will have a response indicating success

2022-08-08T18:20:27.7675780Z info 18:20:27.740:  willSendRequest: disconnect
2022-08-08T18:20:27.7676540Z verbose 18:20:27.740:  [Debug] to kernel: {"command":"disconnect","arguments":{"restart":false},"type":"request","seq":38}
2022-08-08T18:20:27.7718296Z info 18:20:27.744:  RawSession status changed to busy
2022-08-08T18:20:27.7718908Z info 18:20:27.744:  Server Status = busy
2022-08-08T18:20:27.7719684Z verbose 18:20:27.744:  IKernel Status change to busy
2022-08-08T18:20:27.7756869Z info 18:20:27.744:  Debug IO Pub message: {"header":{"msg_id":"eac18432-4d09823b5395a6cbb32cdd37_4790_171","msg_type":"status",...
2022-08-08T18:20:27.7789006Z info 18:20:27.745:  Debug IO Pub message: {"header":{"msg_id":"eac18432-4d09823b5395a6cbb32cdd37_4790_172","msg_type":"debug_event",...
2022-08-08T18:20:27.7793394Z verbose 18:20:27.745:  [Debug] event: {"header":{"msg_id":"eac18432-4d09823b5395a6cbb32cdd37_4790_172","msg_type":"debug_event",...
2022-08-08T18:20:27.7794853Z info 18:20:27.746:  Getting active debug session, emptyPython5df68b73-71c6-445a-9728-77af758824fd..ipynb
2022-08-08T18:20:27.7822046Z info 18:20:27.747:  �[32mWidget Coordinator sent IPyWidgets_msg
2022-08-08T18:20:27.7829570Z info 18:20:27.747:  �[32mPosting message to Notebook UI 
2022-08-08T18:20:27.7830837Z verbose 18:20:27.747:  [Debug] response: {"seq":65,"type":"response","request_seq":38,"success":true,"command":"disconnect"}

[roblourens]

This is possibly what I filed on debugpy: microsoft/debugpy#1051

[roblourens]

A restart issue got mixed up with flaky tests, that's why the iteration plan points at this item, but I think the root issue is that restart does not work right, so I'm fixing #7670 to fulfill this iteration plan item.