Can fold

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

@@ -252,8 +252,8 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
                 " portrait rows=" + portrait2 + " cols=" + portrait2c + " min=" + portrait_min_size +
                 " landscape cols=" + landscape + " min=" + landscape_min_size);
         boolean duo = Helper.isSurfaceDuo();
-        boolean fold6 = Helper.isFold6();
-        boolean close_pane = prefs.getBoolean("close_pane", !duo && !fold6);
+        boolean canFold = Helper.canFold(this);
+        boolean close_pane = prefs.getBoolean("close_pane", !duo && !canFold);
         boolean nav_categories = prefs.getBoolean("nav_categories", false);
 
         // 1=small, 2=normal, 3=large, 4=xlarge
@@ -279,7 +279,7 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
 
         if (content_pane != null) {
             // Special: Surface Duo
-            if (duo || fold6) {
+            if (duo || canFold) {
                 View content_frame = findViewById(R.id.content_frame);
                 ViewGroup.LayoutParams lparam = content_frame.getLayoutParams();
                 if (lparam instanceof LinearLayout.LayoutParams) {

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

@@ -493,6 +493,7 @@ public class DebugHelper {
         sb.append(String.format("Density 1dp=%f\r\n", density));
         sb.append(String.format("Resolution: %.2f x %.2f dp\r\n", dim.x / density, dim.y / density));
         //sb.append(String.format("Max. texture: %d px\r\n", Helper.getMaxTextureSize()));
+        sb.append(String.format("Foldable: %b\r\n", Helper.canFold(context)));
 
         Configuration config = context.getResources().getConfiguration();
 

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

@@ -1728,6 +1728,16 @@ public class Helper {
         return (Build.DEVICE != null) && Build.DEVICE.matches(".+_cheets|cheets_.+");
     }
 
+    static boolean canFold(Context context) {
+        try {
+            PackageManager pm = context.getPackageManager();
+            return pm.hasSystemFeature(PackageManager.FEATURE_SENSOR_HINGE_ANGLE);
+        } catch (Throwable ex) {
+            Log.e(ex);
+            return false;
+        }
+    }
+
     static boolean isWatch(Context context) {
         if (isSmartwatch == null)
             isSmartwatch = _isWatch(context);