Android SeekBar can't be full width even set padding 0 in AppCompat 23.1.0

Question

when I update android support lib from 23.0.1 to 23.1.0, I find the SeekBar is not full width any more.

this is the test XML file:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:divider="@drawable/space_divider"
    android:orientation="vertical"
    android:padding="8dp"
    android:showDividers="middle">

    <View
        android:layout_width="match_parent"
        android:layout_height="20dp"
        android:background="@android:color/black"/>

    <!-- default SeekBar -->
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:progress="50"
        android:progressTint="@android:color/holo_red_dark"/>

    <!-- padding=0 -->
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:padding="0dp"
        android:progress="50"
        android:progressTint="@android:color/holo_red_dark"/>

    <!-- padding=40 -->
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:padding="40dp"
        android:progress="50"
        android:progressTint="@android:color/holo_red_dark"/>

    <android.support.v7.widget.AppCompatSeekBar
        android:layout_width="match_parent"
        android:layout_height="10dp"
        android:padding="0dp"
        android:progress="50"/>

</LinearLayout>

It works well under support lib 23.0.1, like following screenshot. SeekBar has default padding, when I set padding=0 manual, it can be full width. and AppCompatSeekBar is not exist yet.

but under support lib 23.1.0, whether I set how much of padding, SeekBar and AppCompatSeekBar has no any change, like following screenshot.

so, is this the bug of support lib, any body meet this problem and how to resolve it?

thank you~!

update:
It totally confused me, I just have another test, I create a new project, whether I use AppCompat 23.0.1 or 23.1.0, SeekBar neither can be full width after set padding=0, (the compileSdkVersion is 23, buildToolsVersion is "23.0.1", targetSdkVersion is 23). anyway, I want to know how to make SeekBar full width when set padding=0 not work.

the build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        applicationId "com.test.seekbar"
        minSdkVersion 14
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.0.1'
}

Answer 1

finally, I just have a sudden thought. why not try modify it by java code. It works! following is the sample code:

protected void initViews(Context context) {
    LayoutInflater.from(context).inflate(getLayoutResId(), this);
    ButterKnife.bind(this);

    // set style, just once
    seekBar.setProgress(0);
    seekBar.setMax(0);

    seekBar.setPadding(0, 0, 0, 0);

    // ...
}