fix(slider): resize ignored highlightrange setting

[lubber-de]

Description

The new highlightRange option was visually ignored whenever the viewport triggered a resize and also the label were redrawn because of autoAdjust:true

Testcase

• Watch the second example hghlightranges
• resize the viewport so the labels will change
• See the new labels are not highlighted within the selected range
• Clicking on a thumb will re-highlight them again
  https://jsfiddle.net/lubber/1tvumckq/48/