Fixed scroll in 3-col mode

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

@@ -23,6 +23,7 @@ import android.content.Context;
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
 import android.graphics.Color;
+import android.graphics.Rect;
 import android.util.AttributeSet;
 import android.view.Gravity;
 import android.view.MotionEvent;
@@ -76,6 +77,12 @@ public class DrawerLayoutEx extends DrawerLayout {
 
     @Override
     public boolean onInterceptTouchEvent(final MotionEvent ev) {
-        return (!isLocked() && super.onInterceptTouchEvent(ev));
+        if (isLocked()) {
+            Rect rect = new Rect();
+            getChildAt(1).getHitRect(rect);
+            if (!rect.contains((int) ev.getX(), (int) ev.getY()))
+                return false;
+        }
+        return super.onInterceptTouchEvent(ev);
     }
 }