Using the 'directed' sort method, the layout engine seemed to ignore treeSpacing (or only apply it to the first tree). This would also lead to trees colliding with one another, and having their nodes tangled in space. This complaint surfaced in a couple bugs, including #2494. This should be a step toward fixing that. For whatever reason, this code never runs when using the "hubsize" sort method.

If you want to integrate the vis.js sources in a project you need some babel-pugins.

see #2353

Fixes default end, and reduces duplicated code. Adds tests.

* self reference edge should now appear in all cases
* add checks for shape width being NaN to get correct circle data
* reorder resize arguments in Diamond, Dot and Star

* fix #2613 with if statement, and null for pointer value rather than referencing it when undefined

* removed if statement, since not needed, and updated documentation to note the null pointer property in certain conditions.

* Fix redraw order
* Fix error when option is not defined
* Allow template labels
* Add .travis.yml file
* Add experiment travis code
* Fix react example

* updated HISTORY.md for v4.18.0
* bumped package version to 4.18.0

* Fix redraw order
* Fix error when option is not defined
* Allow template labels
* Add .travis.yml file
* Add experiment travis code
* Fix right click button bug when dragging item

* fix(graph2d): fix #2500 for graph2d; improves #2580

* fix(DataSet): make sure the right id-type is used internaly

This fixes a fixed strange string-number conversion issue.
It can happen that id "0" !== 0 what causes #2580.

fixes #2580

* address IE11 issue 'Symbol' is undefined with babel-polyfill  

https://github.com/almende/vis/issues/2560

* address IE11 issue 'Symbol' is undefined with babel-polyfill

https://github.com/almende/vis/issues/2560

* address IE11 issue 'Symbol' is undefined with babel-polyfill

https://github.com/almende/vis/issues/2560

* Fix redraw order

* Fix error when option is not defined

* Allow template labels

* Fix #2538

* Fix redraw order
* Fix error when option is not defined
* Allow template labels
* Add .travis.yml file
* Add experiment travis code

- Also updated docs and examples for this
 - Fixed the positioning of the tooltip if groups was enabled
 - Removed missing parameters from Popup docstring

* Fix redraw order

* Fix error when option is not defined

* Allow template labels

* Fix boolean types bug

* Add subgroup stacking

* Almost finish subgroup stacking

* Play with examples for subgroup order

* Fix stacked subgroups

* Fix subgroup stacking

* Add stackSubgroups option

* Fix example

* Add docs

* Fix onRemove item subgroups recalculate

* Return subgroup example and add stackSubgroup example

* Split stackSubgroup example to subgroup/html and expectedVsActualTimesItems.html

* Fix small bug when subgroups start overlap

Fixes: #2490 (on the correct branch this time)

* Fix redraw order
* Fix error when option is not defined
* Allow template labels
* Fix react example

* Fix redraw order
* Add mouseup, mousedown, mouseover, click and dblclick events on timeline
* Add docs
* Add to evenlistener example
* Add mousemove event listener
* Fix example
* Remove mouseUp and mouseDown events and fix docs for mouseOver
* Remove mouseUp and mouseDown from example

* Fix redraw order
* Fix error when option is not defined
* Allow template labels
* Fix boolean types bug
* Add subgroup stacking
* Almost finish subgroup stacking
* Play with examples for subgroup order
* Fix stacked subgroups
* Fix subgroup stacking
* Add stackSubgroups option
* Fix example
* Add docs
* Fix onRemove item subgroups recalculate
* Return subgroup example and add stackSubgroup example
* Split stackSubgroup example to subgroup/html and expectedVsActualTimesItems.html

* generate custom builds into the dist folder

* updated the we-need-help link in the readme

* general improvements of the readme

* Allow pass the color of points in 'dot-color' mode of Graph3D explicitly - clear the source code and finalize
* Add an onclick callback in Graph3D, to enable click and display customer user-defined information for single data point
* Extra data type validation for string conversion functions in Setings
* Disable onclick callback immediately after rotate/pan
* Re-format the JavaScript file
* No onclick event set by user - properly treat this case now
* Further reformat - indentation
* Handle the case where there is no closest data point

* Added HTML tooltip support for Timeline

* Fixed tooltip position on Firefox

* Added Timeline tooltip example

* Updated tooltip location to be next to the mouse

* Added HTML element to example

* readded depricated option throttleRedraw; fixes #2511

* added doc style for depricated options

* move all babel options to .babelrc file

* updated babel-loader

* element characteristic changes
* assume edge color inheritance is correct before choosing
* Adjust nodes’ chosen’s boolean -> bool
* Need to get user-reset size
* make example edges thicker for more noticeable shadow
* preemptive ES6 fix (see #2500/#2501)
* documentation for the feature that was previously overwritten

* Fix groupEditable
* Fix group drag in vertical direction bug
* Fix indentation
* Add initial nestedGroups property
* Fix redraw order
* Get nested groups hiding working
* Add order to nestedGroups
* Fix up example
* Add support for intially closed nested groups
* Add nested groups indentation
* Fix indents
* Add nested groups docs
* Fix example
* Revert indents
* Add classes to nested and nesting group labels and add nesting group css
* Use pure css for nested group icons
* Remove commented off lines and unnecessary btn
* Fix indents
* Add support to showNested:false in group
* Add semicolon
* Remove empty lines

* Fix redraw order

* Fix error when option is not defined

* Allow template labels

* Fix boolean types bug

* Fix redraw order

* Fix error when option is not defined

* Allow template labels

Fixes: https://github.com/almende/vis/issues/2490

* Fix redraw order

* Fix error when option is not defined

When I was going through the documentation about creating custom builds
I ran into the error outlined at the below link. Applying the suggested
fix solved it so I'm submitting same here.

http://stackoverflow.com/questions/30386317/babelify-throws-parseerror-o
n-import-a-module-from-node-modules

See https://github.com/almende/vis/pull/2460