Select most needed node of many nodes under cursor

[akks]

I was asked to create this ticket by iav on our forum.

Maybe this is duplicate, but I could not find the same one.

Here is the description:

1. Use unglue ways on some node.
2. There are many nodes with the same coordinates now.
3. We can select them by alt-click or middle-click, but we do not know which way corresponds to which node, so we have to drag them randomly or used some complicated features like search and instruments from utilsplugin2
4. Easy solution: when the way is selected and user selects some nodes (by clicking), select mode code should prefer nodes that correspond to already selected line (line will be deselected, of course). Currenly the selection is random.
5. (extra) this could also be implemented for box/lasso selection, but this may change existing behavior.
6. (extra) If the node or relation is selected and user selects a way, prefer ways that have that node (or members of relation) (if there are multiple ways under mouse cursor).

See the animation (swf): ​https://dl.dropboxusercontent.com/u/63393258/josm1.swf

[AlfonZ]

Similar to #8861.
Maybe even duplicate, but I'm not sure which one of these two has superior description.

[akks]

Closed as duplicate of #8861.
Oh, yes, it was there