Added OAuth help

FAQ.md

@@ -1001,11 +1001,13 @@ The easiest way is to use the menu item *Fetch more messages* in the three-dots
 
 An Outlook / Live / Hotmail account can be set up via the quick setup wizard and selecting *Outlook/Office 365*.
 
-To use an Outlook, Live or Hotmail account with two factor authentication enabled, you need to create an app password.
+To use an Outlook, Live or Hotmail account with two factor authentication enabled, you might need to create an app password.
 See [here](https://support.microsoft.com/en-us/help/12409/microsoft-account-app-passwords-two-step-verification) for the details.
 
 See [here](https://support.office.com/en-us/article/pop-imap-and-smtp-settings-for-outlook-com-d088b986-291d-42b8-9564-9c414e2aa040) for Microsoft's instructions.
 
+Please see [this FAQ](#user-content-faq139) for possible causes of the error *... User is authenticated but not connected ...*.
+
 For setting up an Office 365 account, please see [this FAQ](#user-content-faq156).
 
 <br />

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

@@ -118,6 +118,7 @@ public class FragmentOAuth extends FragmentBase {
     private TextView tvGmailDraftsHint;
     private TextView tvOfficeAuthHint;
     private Button btnSupport;
+    private Button btnHelp;
 
     private Group grpError;
 
@@ -162,6 +163,7 @@ public class FragmentOAuth extends FragmentBase {
         tvGmailDraftsHint = view.findViewById(R.id.tvGmailDraftsHint);
         tvOfficeAuthHint = view.findViewById(R.id.tvOfficeAuthHint);
         btnSupport = view.findViewById(R.id.btnSupport);
+        btnHelp = view.findViewById(R.id.btnHelp);
 
         grpError = view.findViewById(R.id.grpError);
 
@@ -190,6 +192,18 @@ public class FragmentOAuth extends FragmentBase {
             }
         });
 
+        btnHelp.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                try {
+                    EmailProvider provider = EmailProvider.getProvider(v.getContext(), id);
+                    Helper.view(v.getContext(), Uri.parse(provider.link), false);
+                } catch (Throwable ex) {
+                    Log.e(ex);
+                }
+            }
+        });
+
         // Initialize
         tvTitle.setText(getString(R.string.title_setup_oauth_rationale, name));
         etName.setVisibility(askAccount ? View.VISIBLE : View.GONE);
@@ -933,6 +947,16 @@ public class FragmentOAuth extends FragmentBase {
                 tvOfficeAuthHint.setVisibility(View.VISIBLE);
         }
 
+        EmailProvider provider;
+        try {
+            provider = EmailProvider.getProvider(getContext(), id);
+        } catch (Throwable exex) {
+            Log.e(exex);
+            provider = null;
+        }
+
+        btnHelp.setVisibility((provider != null && provider.link != null ? View.VISIBLE : View.GONE));
+
         etName.setEnabled(true);
         etEmail.setEnabled(true);
         cbUpdate.setEnabled(true);
@@ -950,6 +974,7 @@ public class FragmentOAuth extends FragmentBase {
     }
 
     private void hideError() {
+        btnHelp.setVisibility(View.GONE);
         grpError.setVisibility(View.GONE);
         tvGmailDraftsHint.setVisibility(View.GONE);
         tvOfficeAuthHint.setVisibility(View.GONE);

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

@@ -181,6 +181,21 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tvOfficeAuthHint" />
 
+        <Button
+            android:id="@+id/btnHelp"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="12dp"
+            android:backgroundTint="?attr/colorInfoBackground"
+            android:drawableEnd="@drawable/twotone_help_24"
+            android:drawablePadding="6dp"
+            android:drawableTint="?attr/colorInfoForeground"
+            android:text="@string/title_setup_help"
+            android:textColor="?attr/colorInfoForeground"
+            android:textStyle="bold"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvOfficeAuthHint" />
+
         <androidx.constraintlayout.widget.Group
             android:id="@+id/grpError"
             android:layout_width="0dp"