Prevent JobManager UI freeze when waiting for a rule in the UI Thread

[laeubi]

Just a draft for @jukzi

[laeubi]

By the way: for this to work more smooth, the default timed wait of 250ms in the Job API might be to long and could potentially feel lagging, I probably would reduce that to 100ms.

[vogella]

By the way: for this to work more smooth, the default timed wait of 250ms in the Job API might be to long and could potentially feel lagging, I probably would reduce that to 100ms.

Sounds fine, but please create a new PR for this.

[mickaelistria]

Code looks very good. Can you please rework the commit message to make it more general and not only focus on JobManager? I think this code here is supposed to avoid UI freezes for most progress monitors, JobManager is just 1 consumer of those. This change may also require a rebase for the build to work.

[laeubi]

I only found this method used in the JobManger, can you give a reference where it is used elsewhere?

[mickaelistria]

You're right, sorry, I was confused with org.eclipse.core.internal.utils.Policy.monitorFor(). So it seems fine to keep this commit message as it.

[laeubi]

I rebased the change now.

[mickaelistria]

"on project org.eclipse.e4.ui.progress: Unqualified OSGi version 0.3.400.qualifier must match unqualified Maven version 0.3.300-SNAPSHOT for SNAPSHOT builds -"

[laeubi]

Next try :-\

[mickaelistria]

Thanks! That's a good change!