TOScrollBar
                                
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                        Jerky handle drag with handleExclusiveInteractionEnabled = true
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With handleExclusiveInteractionEnabled = true, when I grab the scroll bar handle, and drag my finger around quickly (on or away from the handle), it stops recognizing my finger's location, until I slow down a bit, and continue dragging near the handle's x-axis (without ever lifting my finger).
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When the flag is set to default false, it appears to behave as expected, but then you just have to drag around much faster to reproduce the above behaviour. 
Reproducible on the example project with scrollBar.handleExclusiveInteractionEnabled = YES;.
Xcode 9.4 iOS 11.2.1 iPhone X macOS 10.13.5