Hide keyboard on detaching fragment

Do we really need to do this ourselves, Google?

app/src/main/java/eu/faircode/email/FragmentEx.java

@@ -0,0 +1,42 @@
+package eu.faircode.email;
+
+import android.support.v4.app.Fragment;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.AppCompatActivity;
+import android.view.inputmethod.InputMethodManager;
+
+public class FragmentEx extends Fragment {
+    private String subtitle = "";
+
+    protected void setSubtitle(int resid) {
+        setSubtitle(getString(resid));
+    }
+
+    protected void setSubtitle(String subtitle) {
+        this.subtitle = subtitle;
+        updateSubtitle();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        updateSubtitle();
+    }
+
+    @Override
+    public void onDetach() {
+        super.onDetach();
+
+        InputMethodManager im = getContext().getSystemService(InputMethodManager.class);
+        im.hideSoftInputFromWindow(getActivity().getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
+    }
+
+    private void updateSubtitle() {
+        AppCompatActivity activity = (AppCompatActivity) getActivity();
+        if (activity != null) {
+            ActionBar actionbar = activity.getSupportActionBar();
+            if (actionbar != null)
+                actionbar.setSubtitle(subtitle);
+        }
+    }
+}