Run Configurations Dialog: Improve Performance of PDE Tabs

[fedejeanne]

See snapshot:

Snapshot (same as eclipse-jdt/eclipse.jdt.core#1214): open-run-configurations-dialog.zip

Tasks

• Move the long-running operations to the activated method: TestTab (belongs to Plugin Test configuration) --> Not possible, see this comment
• Move the long-running operations to the activated method: PluginsTab

[fedejeanne]

These improvements require eclipse-platform/eclipse.platform#860

[HeikoKlare]

What is the state of this? The required PR has been merged.

[fedejeanne]

See eclipse-pde/eclipse.pde#1232