This was discovered while reviewing 15749

If updating permissions for 2 different users, after applying mass permissions:

• both users should have the same permissions
• the script should "remove" prior permissions and set the new ones write?
  @cdorin?

1. Yes, both users should have the same permissions
2. Yes, the script should remove prior permissions and apply the new ones to the selected group.

Reworked how custom-data is posted to the controller. Specially on checkboxes (which were always sent as TRUE)
Reviewed how checkbox are linked: "general" permission for an activity with the "read"/"update"/"delete"/.... checkboxes.
Reviewed results view

The file listActions.js was updated and that could affect other massive action modals as well.
We haven't found other massive modals which use checkboxes for posting data to the controllers.
Still, would be nice to double check.

PR: https://github.com/LimeSurvey/LimeSurvey/pull/1546/

Tested the issue before pulling the PR, Issue exist. Tested the issue after pulling the PR, below are my findings:
Before PR:https://screencast-o-matic.com/watch/cYjFIpG8oV
After PR: https://screencast-o-matic.com/watch/cYjFIKG8bO
Issue is been fixed I tested by adding and editing the permissions for multiple users from edit permissions, I also logged into user and cross-checked. Working as expected
Please refer the recordings and attachment for more details

16507_EditMasspermissions.png (81,485 bytes)   

16507_EditMasspermissions.png (81,485 bytes)   

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=30382

Fixed in Release 4.3.12+200820