Version:           unspecified (using Devel) 
OS:                Linux

As soon as I enable the "different widgets for each desktop" option, all of my widgets from all desktops/activities are deleted. Further, if I try to re-add a widget, such as folder view, the "add widgets" dialog will show a check box next to it, as if it's on my desktop, but it isn't, since it was deleted.

Reproducible: Didn't try

Steps to Reproduce:
On a fresh configuration (or any configuration where this option has never been used):

1.) Open System Settings
2.) Open "Workspace Behavior"
3.) Click on "Virtual Desktops"
4.) Enable "Different Widgets for each desktop"
5.) All your plasmoids are now deleted from all workspaces/activities
6.) Go to add a plasmoid, and notice the ones that were cleared still have a checkmark as if they are still there

Actual Results:  
Plasmoids are deleted

Expected Results:  
Plasmoids remain intact, or you are at least warned. Also, the blue check marks should not be on plasmoids that are not present.

I have a video of this issue, but it's 2MB, so I'm not sure what the preferred way is to get it to you guys.