CSV export from dashboard does not use filtering

[DaimonPl]

• [ x ] I have checked the superset logs for python stacktraces and included it here as text if any
• [ x ] I have reproduced the issue with at least the latest released version of superset
• [ x ] I have checked the issue tracker for the same issue and I haven't found one similar

Superset version

0.19.1

Expected results

When exporting slice directly from dashboard, dashboard filtering should be applied to CSV

Actual results

Dashboard filter does not apply to exported CSV

Steps to reproduce

1. Create dashboard
2. Add filter visualisation
3. Add any other visualisation
4. Open dashboard, apply filtering
5. Export CSV from dashboard

Looks like fix applied in #1304 does not use dashboard filtering

[JulieRossi]

Hi ! We have noticed this problem too and it would be really helpful if it was solved.
The dashboard filter does not apply either when you explore the slice from the dashboard view. I guess they are related matters.

[mistercrunch]

It should be fixed as of #3461