Requirements - drag&drop requirement groups doesn't work properly

[an-dream]

Prerequisites

• [x] I have written a descriptive issue title
• [x] I have verified that I am running the latest version of the CDP4-IME
• [x] I have searched open and closed issues to ensure it has not already been reported

Description

The following issues have been encountered when dragging and dropping requirement groups: - ISSUE 1: When dragging and dropping a requirement group (containing requirements or not) from a requirement group (old parent) to a requirement specification (new parent), nothing happens. - ISSUE 2: Dragging and dropping requirement group (containing requirements) from a requirement specification (old parent) to a requirement group (contained into the specifcation, new parent) cause apparent loss of contained requirements. If the iteration is closed and the reopened, the requirement reappears. Possibly related issue #116 (closed). ### Steps to Reproduce

ISSUE 1:

1. Create a requirement specification
2. Create a requirement group 1 inside the specification
3. Create a requirement group 2 inside group 1
4. Create a requirement inside group 2
5. Drag and drop requirement group 1 into the requirement specification
6. The last action has no effect

ISSUE 2:

1. Create a requirement specification
2. Create a requirement group 1 inside the specification
3. Create a requirement group 2 inside the specification
4. Create a requirement inside group 2
5. Drag and drop requirement group 2 into group 1
6. Group 2 doesn't show any contained requirements
7. Close and reopen current iteration
8. Now group 1 shows the contained requirement

Logs

• [x] There are no logs regarding the issue
• [ ] I have attached a log file or included the relevant section in this issue

System Configuration

• CDP4 version:
  • [x] CDP4-IME: 6.0.0 RC2
  • [ ] Other:
• Web Services:
  • [ ] CDP4 Web Services version:
  • [ ] OCDT WSP version:
• Environment (Operating system, version and so on):
  • [ ] Microsoft Excel (32/64 bit):
  • [x] Windows OS (32/64 bit): 64 bit Windows 10
  • [ ] Additional information:

[lxatstariongroup]

A change was made in the past that could create Ordered RequirementGroups which 10-25 doesn't define. A addition was made to use a parameter for that. This ordered way of doing starts working based on settings in C:\Users\[USERNAME]\AppData\Roaming\RHEA\CDP4\CDP4Requirements.settings.json. When this ordered way of doing is NOT active, moving a RequirementGroup fails somewhere along the way and basically does nothing. It should move the folder nontheless.