Description of problem:
If you click "Complete" button of task row repeatedly it only works (= it opens Task Details panel) the first time you click it. Clicking it for the 2nd time Closes the task details panel. If you click it any more, it does nothing.

Please see the video attachment illustrating the issue.
This problem is reproducible both in 6.2 product as well as in community kie-wb 6.4.x

Version-Release number of selected component (if applicable):
BPM Suite 6.2.0

How reproducible:
Always

Steps to Reproduce:
1. Create several adhoc tasks in task list and close task details panel.
2. Try clicking Close button for one task repeatedly for some task. Then for some other task.

Actual results:
The Details panel for specific task is only opened on the first click on the "Complete" button. 2nd click closes the details panel and all the following clicks do nothing.

Expected results:
The behavior should be the same whenever the "Complete" button in the task row is clicked (i.e. Task Details panel for that task should be opened).

Additional info:
There's also related jira in the community, that proposes changing the name of the "Complete" button to reflect it's true function. It should be renamed either to "Open" or "Details" to show that it actually DOESN'T complete the task, it just Opens the Details panel where user can complete the task - see https://issues.jboss.org/browse/JBPM-4718