Prevent overwrite of sigint handler #1
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This commit prevents that the SIGINT handler is overwritten by the blickfeld scanner library. It will call the original signint handler.
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This commit prevents that the SIGINT handler is overwritten by the
blickfeld scanner library. It will call the original signint handler.
The problem arises if the scanner library is used in e.g. an asyncio loop.
Then the CancelledError is not called, because the SIGINT is already caught by the blickfeld scanner library.