Redo UF2 discovery for Windows compatibility #2853
Merged
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Windows Python doesn't seem to kill the worker Thread properly when the IDE is exited, leading to a) multiple Python3 instances on a PC after many uses and b) errors updating the core when it tries to re-install Python3 while still having the older version's EXE loaded and in use.
When an exception happens on the input() call under Windows, it seems like it can still leave a thread running. Add one more flag, caught in a global exception handler.
Works around arduino/arduino-cli#2867