double click on MapView node should expand the subtree below it

[Andreas Janz]

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Sidenote: currently, double click starts renaming, but this can be done with F2 or with left click on the already selected node.

[Benjamin Jakimow]

QgsLayerTreeGroups do not expand on double-click, so why should this node expand on?

[Andreas Janz]

1. Would be convenient if double click would work.
2. In many GUIs/Widgets it works like so. E.g. in the Browser Panel

If it is not to mutch of a technical hastle I would appreciate it

[Andreas Janz]

Not much love for this one. I guess it needs to die.