Added option to enable unified system folders

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

@@ -358,14 +358,16 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
             }
         });
 
-        db.folder().liveUnifiedTypes().observe(this, new Observer<List<String>>() {
-            @Override
-            public void onChanged(List<String> types) {
-                if (types == null)
-                    types = new ArrayList<>();
-                uadapter.set(types);
-            }
-        });
+        boolean unified_system = prefs.getBoolean("unified_system", false);
+        if (unified_system)
+            db.folder().liveUnifiedTypes().observe(this, new Observer<List<String>>() {
+                @Override
+                public void onChanged(List<String> types) {
+                    if (types == null)
+                        types = new ArrayList<>();
+                    uadapter.set(types);
+                }
+            });
 
         db.folder().liveNavigation().observe(this, new Observer<List<TupleFolderNav>>() {
             @Override

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

@@ -39,7 +39,7 @@ public class FragmentOptions extends FragmentBase {
 
     static String[] OPTIONS_RESTART = new String[]{
             "startup", "date", "threading", "avatars", "identicons", "circular", "name_email", "subject_italic", "flags", "preview",
-            "addresses", "attachments_alt", "contrast", "monospaced", "autohtml", "autoimages", "actionbar",
+            "addresses", "attachments_alt", "contrast", "monospaced", "autohtml", "autoimages", "actionbar", "unified_system",
             "autoscroll", "swipenav", "autoexpand", "autoclose", "autonext",
             "subscriptions", "debug",
             "biometrics"

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

@@ -63,11 +63,12 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
     private SwitchCompat swCollapseQuotes;
     private SwitchCompat swRemoteContent;
     private SwitchCompat swActionbar;
+    private SwitchCompat swUnifiedSystem;
 
     private final static String[] RESET_OPTIONS = new String[]{
             "theme", "startup", "date", "threading", "avatars", "identicons", "circular", "name_email", "subject_italic",
             "flags", "preview", "addresses", "attachments_alt",
-            "contrast", "monospaced", "inline_images", "autoimages", "collapse_quotes", "autocontent", "actionbar",
+            "contrast", "monospaced", "inline_images", "autoimages", "collapse_quotes", "autocontent", "actionbar", "unified_system"
     };
 
     @Override
@@ -100,6 +101,7 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
         swCollapseQuotes = view.findViewById(R.id.swCollapseQuotes);
         swRemoteContent = view.findViewById(R.id.swRemoteContent);
         swActionbar = view.findViewById(R.id.swActionbar);
+        swUnifiedSystem = view.findViewById(R.id.swUnifiedSystem);
 
         setOptions();
 
@@ -256,6 +258,13 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
             }
         });
 
+        swUnifiedSystem.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("unified_system", checked).apply();
+            }
+        });
+
         PreferenceManager.getDefaultSharedPreferences(getContext()).registerOnSharedPreferenceChangeListener(this);
 
         return view;
@@ -329,6 +338,7 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
         swCollapseQuotes.setChecked(prefs.getBoolean("collapse_quotes", false));
         swRemoteContent.setChecked(prefs.getBoolean("autocontent", false));
         swActionbar.setChecked(prefs.getBoolean("actionbar", true));
+        swUnifiedSystem.setChecked(prefs.getBoolean("unified_system", false));
     }
 
     public static class FragmentDialogTheme extends DialogFragmentEx {

app/src/main/res/layout/fragment_options_display.xml

@@ -339,6 +339,18 @@
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/tvRemoteContentHint"
                 app:switchPadding="12dp" />
+
+            <androidx.appcompat.widget.SwitchCompat
+                android:id="@+id/swUnifiedSystem"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="12dp"
+                android:checked="false"
+                android:text="@string/title_advanced_unified_system"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toBottomOf="@id/swActionbar"
+                app:switchPadding="12dp" />
         </androidx.constraintlayout.widget.ConstraintLayout>
     </ScrollView>
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -224,6 +224,7 @@
     <string name="title_advanced_collapse_quotes">Collapse quoted text</string>
     <string name="title_advanced_remote_content">Automatically show remote content when viewing original messages</string>
     <string name="title_advanced_actionbar">Conversation action bar</string>
+    <string name="title_advanced_unified_system">Show unified folders in navigation menu</string>
 
     <string name="title_advanced_pull_refresh">Pull down to refresh</string>
     <string name="title_advanced_autoscroll">Scroll to top on receiving new messages</string>