Added folder properties help button

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

@@ -63,6 +63,7 @@ public class FragmentFolder extends FragmentBase {
     private CheckBox cbSynchronize;
     private CheckBox cbPoll;
     private CheckBox cbDownload;
+    private Button btnHelp;
     private EditText etSyncDays;
     private EditText etKeepDays;
     private CheckBox cbKeepAll;
@@ -112,6 +113,7 @@ public class FragmentFolder extends FragmentBase {
         cbSynchronize = view.findViewById(R.id.cbSynchronize);
         cbPoll = view.findViewById(R.id.cbPoll);
         cbDownload = view.findViewById(R.id.cbDownload);
+        btnHelp = view.findViewById(R.id.btnHelp);
         etSyncDays = view.findViewById(R.id.etSyncDays);
         etKeepDays = view.findViewById(R.id.etKeepDays);
         cbKeepAll = view.findViewById(R.id.cbKeepAll);
@@ -140,6 +142,13 @@ public class FragmentFolder extends FragmentBase {
             }
         });
 
+        btnHelp.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Helper.viewFAQ(getContext(), 39);
+            }
+        });
+
         cbKeepAll.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

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

@@ -157,15 +157,28 @@
 
             <TextView
                 android:id="@+id/tvSyncDaysRemark"
-                android:layout_width="wrap_content"
+                android:layout_width="0dp"
                 android:layout_height="wrap_content"
                 android:layout_marginTop="6dp"
                 android:text="@string/title_sync_days_remark"
                 android:textAppearance="@style/TextAppearance.AppCompat.Small"
                 android:textStyle="italic"
+                app:layout_constraintEnd_toStartOf="@+id/btnHelp"
                 app:layout_constraintStart_toStartOf="parent"
                 app:layout_constraintTop_toBottomOf="@id/tvSyncDays" />
 
+            <Button
+                android:id="@+id/btnHelp"
+                style="?android:attr/buttonStyleSmall"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:minWidth="0dp"
+                android:minHeight="0dp"
+                android:text="@string/title_setup_help"
+                app:layout_constraintBottom_toBottomOf="@+id/tvSyncDaysRemark"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintTop_toTopOf="@+id/tvSyncDaysRemark" />
+
             <EditText
                 android:id="@+id/etSyncDays"
                 android:layout_width="match_parent"
@@ -174,7 +187,7 @@
                 android:inputType="number"
                 android:textAppearance="@style/TextAppearance.AppCompat.Medium"
                 app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintTop_toBottomOf="@id/tvSyncDaysRemark" />
+                app:layout_constraintTop_toBottomOf="@id/btnHelp" />
 
             <TextView
                 android:id="@+id/tvKeepDays"