Changed dripping date still sends emails to learners of completed courses

[RiaanKnoetze]

Link to ticket: https://woothemes.zendesk.com/agent/tickets/368952

Customer reports:

Once a user has completed a course, the course should not be dripping for this user again.

When a course has been marked completed, the learner should not be receiving dripping emails again in the event that the drip dates are changed by admin.

This also seems interlinked with:

• #89
• #48
• #88

[WillBrubaker]

@danjjohnson

There is another ticket for this here: https://woothemes.zendesk.com/agent/tickets/388774

[danjjohnson]

This isn't technically a bug. Content drip wasn't designed to use the same course over multiple drip schedules, so that is a feature request.

Workaround: Remove the old learners from the course manually so that they don't receive the drip emails a second time.

cc: @WillBrubaker @RiaanKnoetze

[richardmtl]

This came up in 431888-zd-woothemes.