What does Ctrl + S + S do on Xamarin Android.axml files in Visual Studio?

This is my original .axml file .

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

  <ListView android:id="@+id/List"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:cacheColorHint="#00000000"
  />

</LinearLayout>

      

        
        
        
      

    

I saved it and pressed Ctrl+S

it as usual, but then accidentally hit S

it without letting go Ctrl

, so hit it effectively Ctrl+S+S

. This resulted in the following code formatting:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <ListView
        android:id="@+id/List"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:cacheColorHint="#00000000" />
</LinearLayout>

      

        
        
        
      

    

Note that this again differs from the shortcut Ctrl+E+D

I'm used to, which results in code formatting differently according to below.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
  <ListView
      android:id="@+id/List"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:cacheColorHint="#00000000" />
</LinearLayout>

      

        
        
        
      

    

My question is, what exactly did I do? Which function or macro did I accidentally call? I tested this keyboard shortcut in a regular .cs file as well as an .xml file and this keyboard shortcut does nothing there. I quickly went through Tools -> Options -> Keyboard , but there is too much noise and I cannot filter it intelligently (as far as I know). Anyway, I have not previously changed anything in this VS instance, and I have not had anything like ReSharper.