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* priority, start/due dates, progress, estimate, spent time roll-up to parent issues
* descendant issues tree displayed on the issue view with context menu support
* issue tree display on the gantt chart
* issue tree copy on project copy
* unlimited nesting

Defining subtasks requires the new permission 'Manage subtasks'.
Subtasks can not belong to a different project than the parent task.

Implementation is based on scoped nested sets for fast reads and updates.

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* Adds watched_by class method in ActsAsWatchable
* Adds Issue#recently_updated, Issue#with_limit and Issue#on_active_project

  #2482

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* ja (#4946)
* zh-TW (#4947)
* ru



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Fixed: NoMethodError error on roadmap if no trackers are selected and a shared version is available (#5006).

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