[selectors] modify workflow selectors: is_in_state, on_transition - factorize `is_on_state` selector - add new `on_transition` selector Especially useful to match pending transitions to enable notifications when your workflow allows several transition to the same states. Note that if workflow `change_state` adapter method is used, this selector will not be triggered. In debug mode: These both selectors will check against the entity current workflow if expected values given in selector argument are valid. ValueError exception will be raised for unmatching state/transition names against the current workflow (generic etype workflow). (check against custom workflow is not implemented)

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CSS Coding Standards

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(Draft, to be continued)

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:Naming: camelCase

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Indentation rules

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- 2 espaces avant les propriétés

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- pas d'espace avant les ":", un espace après

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- 1 seul espace entre les différentes valeurs pour une même propriété

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Documentation

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Please keep rules semantically linked grouped together, with a comment about

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what they are for.

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Recommendation

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- Try to use existing classes rather than introduce new ones

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- Keep things as simple as possible while in the framework

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- Think about later customization by application

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- Avoid introducing a new CSS file for a few lines of CSS, at least while the

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  framework doesn't include packing functionalities

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