Provide more information in mouse drag events

Registered by Paul "LeoNerd" Evans

Similar to the Perl code that works on the Window layer; we should emit drag_start/drag_drop events. Include original start position.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Medium
Drafter:
Paul "LeoNerd" Evans
Direction:
Approved
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Not started
Milestone target:
None

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