Closing a project can lead to unresolved references to predeclared properties

[lwrage]

Summary

In a workspace with multiple unrelated projects closing one of them can result in unresolved references in the other project. A clean build fixes the issue.

Expected and Current Behavior

Closing an unrelated project should not have any influence on the remaining projects.
Currently closing a project makes all references to contributed AADL files unresolved.

Steps to Reproduce

1. Create two projects A, and B with one AADL file each
2. Add a property association for a predeclared property to B,aadl
3. Close project A

Environment

• OSATE Version: 2.7.0
• Operating System: macOS, Linux

[lwrage]

Closing the project removes all files in the closed project from the index, including plugin contributed AADL. It should be possible to address this in PropertiesToBeBuiltComputerContribution.removeProject().

Note: May need to take this into account in the context of #1134