title: app:contentInsetStartWithNavigation="0dp" isn't working in ToolBar
body: <p>I'm trying to display an <code>ImageView</code> spanning the entire toolbar (I can't use background).  here's my ToolBar layout:</p>
  
  <pre><code>&lt;android.support.design.widget.AppBarLayout
      android:id="@+id/appbar"
      android:layout_alignParentTop="true"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:minHeight="@dimen/appbar_height"
      android:background="@drawable/backgorund_toolbar_tranluscent"&gt;
  
      &lt;android.support.v7.widget.Toolbar
          style="@style/ToolBarStyle"
          android:id="@+id/toolbar"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:background="@color/material_grey_700"
          app:contentInsetStartWithNavigation="0dp"
          app:contentInsetStart="0dp"
          app:contentInsetLeft="0dp"
          android:minHeight="@dimen/appbar_height"&gt;
  
          &lt;android.support.percent.PercentRelativeLayout
              android:layout_width="match_parent"
              android:layout_height="wrap_content"&gt;
  
              &lt;ImageView
                  android:id="@+id/thumbnail"
                  app:layout_widthPercent="100%"
                  app:layout_aspectRatio="178%"
                  android:scaleType="centerCrop"
                  android:background="@color/material_grey_700"
                  tools:ignore="ContentDescription" /&gt;
  
              &lt;RelativeLayout
                  android:layout_alignBottom="@id/thumbnail"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"&gt;
  
                  &lt;TextView
                      android:id="@+id/title"
                      android:layout_alignParentTop="true"
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:paddingLeft="8dp"
                      android:paddingRight="8dp"
                      android:maxLines="3"
                      android:ellipsize="end"
                      android:textColor="@color/app_primary_text_default_material_dark"
                      android:textAppearance="@style/TextAppearance.AppCompat.Title"/&gt;
  
                  &lt;LinearLayout
                      android:id="@+id/details"
                      android:orientation="horizontal"
                      android:layout_width="match_parent"
                      android:layout_height="wrap_content"
                      android:layout_below="@id/title"
                      android:paddingLeft="8dp"
                      android:paddingRight="8dp"
                      android:paddingBottom="8dp"&gt;
  
                      &lt;TextView
                          android:id="@+id/uploader"
                          android:layout_width="match_parent"
                          android:layout_height="wrap_content"
                          android:layout_weight="1"
                          android:textColor="@color/app_primary_text_default_material_dark"
                          android:textAppearance="@style/TextAppearance.AppCompat.Body1" /&gt;
  
                      &lt;TextView
                          android:id="@+id/duration"
                          android:layout_width="match_parent"
                          android:layout_height="wrap_content"
                          android:layout_weight="4"
                          android:gravity="end"
                          android:textColor="@color/app_primary_text_default_material_dark"
                          android:textAppearance="@style/TextAppearance.AppCompat.Body1" /&gt;
                  &lt;/LinearLayout&gt;
  
                  &lt;me.zhanghai.android.materialprogressbar.MaterialProgressBar
                      android:id="@+id/progress"
                      android:layout_width="match_parent"
                      android:layout_height="2dp"
                      android:layout_below="@id/details"
                      style="@style/Widget.MaterialProgressBar.ProgressBar.Horizontal"
                      app:mpb_progressStyle="horizontal"
                      app:mpb_useIntrinsicPadding="false"
                      android:indeterminate="false"/&gt;
              &lt;/RelativeLayout&gt;
          &lt;/android.support.percent.PercentRelativeLayout&gt;
      &lt;/android.support.v7.widget.Toolbar&gt;
  &lt;/android.support.design.widget.AppBarLayout&gt;
  </code></pre>
  
  <p>As you can see I have added </p>
  
  <pre><code>        app:contentInsetStartWithNavigation="0dp"
          app:contentInsetStart="0dp"
          app:contentInsetLeft="0dp"
  </code></pre>
  
  <p>as suggested by answers to many similer questions. I'm still getting an inset on the left side.</p>
  
  <p>I'm using the following code in setting up ActionBar:</p>
  
  <pre><code>    ActionBar actionBar = getSupportActionBar();
      if (actionBar != null) {
          actionBar.setDisplayHomeAsUpEnabled(true);
          actionBar.setDisplayShowTitleEnabled(false);
      }
  </code></pre>
  
  <p>FYI, <code>actionBar.setDisplayHomeAsUpEnabled(false)</code>removes the inset and along with it the navigation up icon, which is not acceptable. Any way I can fix it other than adding my own custom up icon?</p>
  
  <p>FYI2, <code>@style/ToolBarStyle</code> just inherits from <code>Theme.AppCompat</code>.</p>