Yield in each loop of observe_value #648
Merged
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This helps in the very specific case of an observe_value directly or indirectly modifying the signal that is being updated. This creates a busy loop which will not be interrupted by wrapping in asyncio.wait_for. To demonstrate, added
test_observe_value_times_out_with_no_external_task
Originally discussed in DiamondLightSource/dodal#897