Extend "Keep the Duration" functionality to event time

[matt-buckley]

The event editing dialog in Thunderbird has a useful feature whereby the duration of an event in days can be kept when changing the start or end date of an event, or changeable, depending on a chain icon next to the start and end date fields. It would be helpful if this also applied to event times, i.e. when the duration should be kept, changing the start time of an event will not change the end time, and vice-versa.

[Jon]

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