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Users can now indicate that a symbol should be treated as a animated
symbol, through the new "Animation Settings" option in the symbol
widget's Advanced menu.
This settings panel allows users to enable animation for the symbol
and set a specific frame rate at which the symbol should be redrawn.
When enabled, the @symbol_frame variable can be used in any
symbol data defined property in order to animate that property.
For instance, setting the symbol's rotation to the data defined
expression
@symbol_frame % 360
will cause the symbol to rotate over time. (with rotation speed
dictated by the symbol's refresh rate)