Added support for split screen

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

@@ -44,6 +44,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.ImageButton;
+import android.widget.LinearLayout;
 import android.widget.Toast;
 
 import androidx.annotation.NonNull;
@@ -183,6 +184,15 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
         content_separator = findViewById(R.id.content_separator);
         content_pane = findViewById(R.id.content_pane);
 
+        if (!portrait && !landscape3 && Helper.isSplitScreen()) {
+            View content_frame = findViewById(R.id.content_frame);
+            ViewGroup.LayoutParams lparam = content_frame.getLayoutParams();
+            if (lparam instanceof LinearLayout.LayoutParams) {
+                ((LinearLayout.LayoutParams) lparam).weight = 1;
+                content_frame.setLayoutParams(lparam);
+            }
+        }
+
         drawerLayout = findViewById(R.id.drawer_layout);
 
         final ViewGroup childContent = (ViewGroup) drawerLayout.getChildAt(0);

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

@@ -677,6 +677,10 @@ public class Helper {
         return 0;
     }
 
+    static boolean isSplitScreen() {
+        return ("Microsoft".equalsIgnoreCase(Build.MANUFACTURER) && "Surface Duo".equals(Build.MODEL));
+    }
+
     // Graphics
 
     static int dp2pixels(Context context, int dp) {