Added inbox sub folder hint

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

@@ -74,6 +74,7 @@ public class FragmentFolder extends FragmentBase {
     private CheckBox cbAutoDelete;
     private Button btnSave;
     private ContentLoadingProgressBar pbSave;
+    private TextView tvInboxRootHint;
     private ContentLoadingProgressBar pbWait;
     private Group grpParent;
     private Group grpPoll;
@@ -130,6 +131,7 @@ public class FragmentFolder extends FragmentBase {
         cbAutoDelete = view.findViewById(R.id.cbAutoDelete);
         btnSave = view.findViewById(R.id.btnSave);
         pbSave = view.findViewById(R.id.pbSave);
+        tvInboxRootHint = view.findViewById(R.id.tvInboxRootHint);
         pbWait = view.findViewById(R.id.pbWait);
         grpParent = view.findViewById(R.id.grpParent);
         grpPoll = view.findViewById(R.id.grpPoll);
@@ -209,6 +211,7 @@ public class FragmentFolder extends FragmentBase {
         grpAutoDelete.setVisibility(View.GONE);
         btnSave.setEnabled(false);
         pbSave.setVisibility(View.GONE);
+        tvInboxRootHint.setVisibility(View.GONE);
         pbWait.setVisibility(View.VISIBLE);
 
         return view;
@@ -269,6 +272,8 @@ public class FragmentFolder extends FragmentBase {
                         cbAutoDelete.setChecked(folder != null && folder.auto_delete);
                         grpAutoDelete.setVisibility(View.VISIBLE);
                     }
+
+                    tvInboxRootHint.setVisibility(folder == null && parent == null ? View.VISIBLE : View.GONE);
                 }
 
                 // Consider previous save as cancelled

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

@@ -300,7 +300,7 @@
             android:text="@string/title_auto_delete_hint"
             android:textAppearance="@style/TextAppearance.AppCompat.Small"
             android:textStyle="italic"
-            app:layout_constraintEnd_toStartOf="@+id/btnInfo"
+            app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/cbAutoDelete" />
 
@@ -325,6 +325,18 @@
             app:layout_constraintStart_toEndOf="@id/btnSave"
             app:layout_constraintTop_toTopOf="@id/btnSave" />
 
+        <eu.faircode.email.FixedTextView
+            android:id="@+id/tvInboxRootHint"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="6dp"
+            android:text="@string/title_inbox_root_hint"
+            android:textAppearance="@style/TextAppearance.AppCompat.Small"
+            android:textStyle="italic"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/btnSave" />
+
         <eu.faircode.email.ContentLoadingProgressBar
             android:id="@+id/pbWait"
             style="@style/Base.Widget.AppCompat.ProgressBar"

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

@@ -675,6 +675,10 @@
     <string name="title_auto_trash">Automatically move old messages to trash</string>
     <string name="title_auto_delete">Automatically permanently delete old messages</string>
     <string name="title_auto_delete_hint">Old messages are messages that are no longer kept on the device</string>
+    <string name="title_inbox_root_hint">
+        Some providers require new folders to be created below the inbox.
+        In this case, you can long press the inbox in the folder list and select \'Create sub folder\'.
+    </string>
     <string name="title_folder_name_missing">Folder name missing</string>
     <string name="title_folder_exists">Folder %1$s exists</string>
     <string name="title_folder_delete">Permanently delete this folder and any messages it contains?</string>