Move focus to the editor when showing references

[Neurrone]

/CC @isidorn

Fixes microsoft/vscode#97817

• Move focus to the editor when showing references from the references view, call hierarchy and history.

[Neurrone]

I'm fairly sure that this behaviour is desirable for the call hierarchy and find all references. But am not sure whether it would be for history. If it isn't I'll remove the change for the history item.

[isidorn]

Assigning to @jrieken for an intial review. Feel free to assign back to me if you would prefer that review this.

[jrieken]

Lgtm. Thanks!

[jrieken]

This has actually caused microsoft/vscode#100726 and is the opposite of what has been done here. In other views (like explorer or search) we do not change focus on click (or the primary open gesture) but only on double click.

[Neurrone]

Yeah, I thought about this but the tree view API doesn't allow implementing the approach the explorer tree uses because the capability is not exposed as far as I can tell.

I'm OK with reverting this first until a better solution is found.