low performance with widget in NestedScrollView

[frog1014]

use widget: Very not smooth when sliding lightness bar. it won't be consequent sliding to choose a color on the wheel hue.

colorpicker 0.0.13 android 7.0 @Galaxy s7

compileSdkVersion 26 buildToolsVersion '26.0.1' defaultConfig {

    minSdkVersion 21
    targetSdkVersion 26