JBT 4.3.0.Final / JBDS 9.0.0.GA target platforms include org.eclipse.egit.importer.ui 4.0, which installs jgit 4.0; this breaks egit 4.1.1 views when JBT 4.3.0 or JBDS 9.0.0 are installed into Mars.2

Installing Red Hat JBoss Developer Studio 9.0.0GA into a fresh Eclipse 4.5.2 (for Eclipse Committers) causes Egit to break.

1. Install Eclipse 4.5.2
2. In the Marketplace, search for "jboss developer studio"
3. You get a single result: Red Hat JBoss Developer Studio 9.0.0 GA
4. Install it
5. Restart
6. Observe: the EGit views and preferences are missing
7. Observe: you get messages in the Eclipse error log concerning a dependency version incompatibility

JBT 4.3.0.Final / JBDS 9.0.0.GA target platforms include org.eclipse.egit.importer.ui 4.0.0.201506090130-r (Mars.1 version), which installs jgit 4.0.3.201509231615-r (Mars.1 version); this breaks egit 4.1.1 views when installed into Mars.2, because Mars.2 site does not include org.eclipse.egit.ui.importer 4.1.1.201511131810-r, and you confuse egit when you have both jgit 4.0 and 4.1 installed, disabling views and preferences.

Solution proposed is to add org.eclipse.egit.ui.importer 4.1.1.201511131810-r to the composite site from which JBT 4.3.0.Final and JBDS 9.0.0.GA are installed, so that when org.eclipse.egit.ui.importer is installed, p2 can select the 4.1.1 version instead of the 4.0.0 version.

I would want to pull a mirror of http://download.eclipse.org/egit/updates-4.1.1/ onto download.jboss.org if we're cool with this solution.