reduce gaps between marks

[just-boris]

Now even short enough labels can't fit into one string.

I have this in my app:

With my fix, it would be better. Borders are especially have been added to show mark constraints:

[benjycui]

👍

[benjycui]

IMO, this is just a temporal patch. It is still a problem in this use case:

What we should do is optimize the implementation of Slider.Marks.

[just-boris]

Well, this case is more difficult. I see two options here:

1. Do not rely on marks count, use step value to find the appropriate mark width. For your case the minimal step is 10, so mark width would be 10/(100 - (-10)) * 100 = 9%
2. Make some more flexible layout, where marks may not be centered, just fill free space on any side near the dot