Allow app to track callback change #2206
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This allows apps to answer the question "was I already called as part of handling this particular event?" from anywhere in the code, by tracking the callback counter. In particular this is useful to simplify https://github.com/Ten0/homeassistant_python_typer/blob/1f8075ae6655a65aab093f20fa4624d6587a201b/README.md#what-to-be-careful-about
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This allows apps to answer the question "was I already called as part of handling this particular event?" from anywhere in the code, by tracking the callback counter.
In particular this is useful to simplify https://github.com/Ten0/homeassistant_python_typer/blob/1f8075ae6655a65aab093f20fa4624d6587a201b/README.md#what-to-be-careful-about