The Process Preview modal is rendered incorrectly in kie-wb 6.4.x - the designer iframe does not fit into the modal and overflows it (see screenshot).

Following up on discussion in PR 98# the way the Process Preview modal is rendered needs to be fixed. From the discussion it seems that the issue is not in the designer code itself, but in the Uberfire code that controls the popup. Could you please investigate / fix the problem?

Steps to reproduce:
1) start any process instance
2) go to Process Instances persp,
3) click the row with the instance to open details panel on the right
4) In the panel on the right click Options > Process Model.