[Slider][RangeSlider] valueFrom and valueTo can have the same value

[manabu-nakamura]

trafficstars

closes #2787

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
    <com.google.android.material.slider.Slider
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:valueFrom="0"
        android:valueTo="2"
        app:labelBehavior="visible" />
    <com.google.android.material.slider.Slider
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:valueFrom="0"
        android:valueTo="2"
        android:stepSize="1"
        app:labelBehavior="visible" />
    <com.google.android.material.slider.RangeSlider
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:valueFrom="0"
        android:valueTo="2"
        app:values="@array/initial_slider_values"
        app:labelBehavior="visible" />
    <com.google.android.material.slider.Slider
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:valueFrom="0"
        android:valueTo="0"
        app:labelBehavior="visible" />
    <com.google.android.material.slider.Slider
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:valueFrom="0"
        android:valueTo="0"
        android:stepSize="1"
        app:labelBehavior="visible" />
    <com.google.android.material.slider.RangeSlider
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:valueFrom="0"
        android:valueTo="0"
        app:values="@array/initial_slider_values"
        app:labelBehavior="visible" />
</LinearLayout>

<resources>
    <array name="initial_slider_values">
        <item>0</item>
        <item>0</item>
    </array>
</resources>

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