Opening Process Sources twice breaks the modal

Description of problem:
When user opens the Process Sources modal in Designer, the underlying gui is still available - it is possible to "open" the same modal again. Doing this breaks the modal - if you try to move it around, it leaves "ghost" modals. See screenshot. It is not possible to get rid of it either.

Version-Release number of selected component (if applicable):
6.2 ER5

Steps to Reproduce:
1. Open a process in the Designer.
2. Click on the "share" button and select View Process Sources.
3. Repeat step 2.
4. Grab theProcess Sources modal and move it around a few times.

Actual results:
See screenshot.

Expected results:
It is either not possible to execute step 3 - the rest of the designer is not accessible (the same way modals in the rest of the business-central "cover" the rest of the gui) - or doing so doesn't break anything.

Additional info:
The same happens with the other "share" options and also, it seems, when they are combined.