The data object to pass to the command (and its handler) as it executes. This carries information about the current state of the application, and the application context in which the command was executed.
An execution event carries three blocks of data: the parameters, the trigger, and the application context. How these blocks are used is application dependent. In the Eclipse workbench, the trigger is an SWT event, and the application context contains information about the selection and active part.
@since 3.1
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