[BUG] Time scale skipping values in 2.6

[dracos]

Version 2.5 (left below): https://codepen.io/dracos/pen/OgjpPv
Version 2.6 (right below): https://codepen.io/dracos/pen/oweZjB

With version 2.5, the graph displays all its time values fine, but with 2.6 it skips some of them, though there is room to fit them in.

[danegraphics]

This doesn't only apply to the time scale. It also applies to regular bar and other graphs.

I think some changes were made as to the threshold of space allowed before it starts removing values, but IMO as well, the amount of space is too large.

[etimberg]

work around is to set ticks.autoSkip: false on the x axis. I'm happy to look at a PR that improves this.

[andig]

@etimberg time axis already has autoSkip: false. Looking at the code of the auto skipper plus setting a break point there shows that its not the auto skipper that omits the missing labels.

What else could be responsible for this?

Side node: the trailing 2017 looks odd, too,

[glen-84]

Here's another example, with autoSkip disabled: https://jsfiddle.net/1Lmruv73/1/