title: App writes to external storage without permission
body: <p>I have an app which uses the following permission:</p>
  
  <pre><code>&lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;
  </code></pre>
  
  <p>I am building the app for Android 6.0:</p>
  
  <pre><code>android {
      compileSdkVersion 23
      buildToolsVersion "23.0.1"
  
      defaultConfig {
          applicationId "de.my.package"
          minSdkVersion 14
          targetSdkVersion 23
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  </code></pre>
  
  <p>When i now start the app and write to the external storage i do not get asked for the permission on Nexus 5 with Android 6.0 even when i did not set the permission:</p>
  
  <p><a href="https://i.stack.imgur.com/Yscbi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Yscbi.png" alt="enter image description here"></a></p>
  
  <p>Why and how is the App able to write to the external storage without permission?</p>