macOS demo bar chart's first and last bar got half cut

[liuxuan30]

on master branch, macOS demo bar chart's first and last bar got half cut. Another post #1446 mentioned similar, however it's about fitBars=true. OS X demo disabled fitBar still face same issue.
Will look into if free or someone can catch.

[danielgindi]

@PhilJay I'm guessing that a bar at x=0.0, will get cut on the left as there's a bar width that gets from -0.5 to 0.5 right?

[PhilJay]

Yes, exactly. The fitBars(true) method should fix that. :-)

[danielgindi]

There was a bug with fitBars implementation here, fixed :-)

[liuxuan30]

@danielgindi I did check fitBars are turned off and having the issue. With #1452 and #1486 it's fixed if we turn it on. However, If fitBars turned off, seeing cutting off is expected? By default it's false, kind of confused here