Fix hiding edge tooltip when a node is hovered

[Gelio]

When supplying an edge tooltip (title) without providing a node tooltip (title), the edge's tooltip will be displayed even though the node is hovered and the tooltip is in the background.

This PR fixes that behavior.

[micahstubbs]

@yotamberk could you tag this one as network when you have a moment?

[micahstubbs]

@Gelio thanks for the sending this PR with the fix! appreciate the screenshot as well 😄

Curious, could you provide a new example that we can use to verify the fix, or point us to an existing example that shows the bug behavior (and would also show the fix)?

https://github.com/almende/vis/tree/master/examples/network

said another way, could you provide steps to test this PR?

[Gelio]

@micahstubbs Sure, no problem.

Take a look at data/scalingNodesEdges.html.

1. Hover over an edge until the tooltip appears
2. Move the mouse towards a node (following the edge)
3. Move the mouse into the node (following the edge)

The tooltip does not disappear, even though the edge is technically not visible now since the node is on top of it.

[micahstubbs]

@Gelio thanks for the steps to test! the fix looks good to me ✅

http://127.0.0.1:51702/examples/network/data/scalingNodesEdgesLabels.html

before

after

[Gelio]

@micahstubbs Awesome 👍 Thank you for verifying it and providing the gifs 😄

[micahstubbs]

@Gelio of course! I've accepted this improvement over on our community fork https://github.com/visjs-community/visjs-network

visjs-community/visjs-network#26

hopefully the maintainers here will see the review and accept the PR as well 😄

[Gelio]

@micahstubbs Great, thanks 😃

[mojoaxel]

💌 Thanks @Gelio for your contribution!
This pull-request has been merge into visjs/vis-network#21