Only load the target platform on user request and not automatically

[vogella]

Extraced from @laeubi comment https://bugs.eclipse.org/bugs/show_bug.cgi?id=576844#c3

I think the target should only ever be updated if I actively press "Set as active Target".

Also from @HannesWell coment https://bugs.eclipse.org/bugs/show_bug.cgi?id=576844#c5

The Target-Platform should only be refreshed/reloaded/updated if asked to do so for the reasons you have mentioned.

[laeubi]

I think it is a bit unclear here what means "Only load the target platform on user request", what should happen is that the target is loaded + resolved but it should not replace the current target platform state unless user press Set as active Target or Reload Target.

[HannesWell]

what should happen is that the target is loaded + resolved but it should not replace the current target platform state unless user press Set as active Target or Reload Target.

Absolutely.

Recently I already started to look into the TP resolving/reloading process in more detail with the goal to make it more robust.
Changing this was one goal of that.
I'm currently contemplating to try out Christophs suggestion from a short chat about this topic at EclipseCon, that actually the resolution could happen without a P2-profile.
Of course the resolution should happen purely on P2 metadata and should not download any artifact (I actually had the impression that this would happen on set/reload, but I'll verify this).

[laeubi]

@vogella can you check latest release? There should be a noticeable speed improvement already now.