Visual shader editor node selection and position issues

[jscheel]

Operating system or device, Godot version, GPU Model and driver (if graphics related):
macOS: 10.12.5 macbook pro (retina)
godot: 2.1.3 and 2.1.4

Issue description:

• After adding a node, several nodes will be randomly selected. (2.1.3 and 2.1.4)
• Randomly, when selecting a node or making a connection, several other nodes will be selected. (2.1.3 and 2.1.4)
• Sometimes, you cannot deselect a node. (2.1.4, haven't replicated on 2.1.3)
• When panning, if a node is selected, the node moves as well. (2.1.4)
• After deleting a node, several random nodes are selected. When the mouse moves all of the selected nodes are repositioned on top of each-other. (2.1.3 and 2.1.4)
• Node positions are hidpi dependent. Meaning, if I organize my graph on a retina display, then open godot on a normal display, the nodes are 2x further apart from each-other. (only tested on 2.1.4, will have to test 2.1.3 when I have my other monitor again)

(Example of post-delete repositioning)

[jscheel]

Added two additional, smaller bugs to the list. This can be broken out to separate issues, but I'm thinking these are probably all symptoms of one larger bug with selection in the graph editor.

[blurymind]

I also get this bug, it's really annoying.

Sometimes nodes get constantly resized too

[jscheel]

Ok, added which 2.1.x versions that each issue have been tested on, and added another issue regarding hidpi positioning of nodes.

[eon-s]

The issue is on GraphEdit too or just the shader editor? (I don´t remember this problem on 2.2 visual script editor)

[jscheel]

@eon-s as in a GraphEdit node placed in a scene, or is there another place?

[eon-s]

I was sure that saw this before #4433

Maybe the fix was not ported to 2.1.

[akien-mga]

The 2.1 branch is no longer actively worked on by engine developers, unless critical fixes are needed for current games in production. As such we are now closing non-critical bug reports affecting only the 2.1 branch.

Please comment if this was incorrectly triaged and is still relevant in 3.x versions.