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vim700: spelllang=en spell

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- Pd::Bar
    - pimpl
- Pd::Graph
    - Set trigger
    - getValues()
- Pd::Digital
    - calculate border with to get textRect.
- Do not call clearData() when changing variable connection.
- Emit ScalarVariable::disconnected() signal.

- Exceptions and message handling.
- Implement default values for all widgets, if not connected.

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