Andrey Loskutov

Note, some of the information (like hostname) might require API calls that might hang Eclipse, so we should avoid using them. Other data (like `DISPLAY`) might be only available on...

Fixed via https://github.com/eclipse-platform/eclipse.platform.ui/pull/2347

I've just rebased on head to see current test result.

@raghucssit : could you please update the fix & rebase?

I've first rebased but then I saw that version (and some smaller code) changes needed so I've amended last commit. Here is the diff: https://github.com/eclipse-platform/eclipse.platform.ui/compare/ee5c4b2479915e3b26c3f4b5c552d9dc1d041c88..73abc2ff90c58692f34047a21712f5d299b9ca57

> The service handling looks fine now I just have some remarks as this is adding new API at a very late stage Come on, we are in M2 now....

> Is there a good way to actually test this? Start IDE in debugger on this PR, go to Preferences / Capabilities, switch off PDE  and check that Window...

> So when adding a new E4 service it should at laest be designed with such use-case in mind Let name it `E3ActivityManagerBridge` or `E3ActivityManagerProxy` or `InternalE3ActivityManagerServiceHelper` to avoid confusion...

> Thanks I'll try that out, so mentioned "category" (==getEnabledActivityIds() would be "general") and "Identifier" (== PDE) ? No. Just check in debugger what you will see in ActivityManagerProxy.isIdentifierEnabled().

> @raghucssit @iloveeclipse I have now created > > * [Consider Activity Filtering when running in E3 compatibility mode #2768](https://github.com/eclipse-platform/eclipse.platform.ui/pull/2768) > > this does not require any new service and...