Expose HumanQrGrantLoginError::Unknown reason in error message

Author: hughns

bindings/matrix-sdk-ffi/CHANGELOG.md

@@ -44,6 +44,8 @@ All notable changes to this project will be documented in this file.
 
 ### Features
 
+- Expose `HumanQrGrantLoginError::Unknown` reason in error message.
+  ([#6514](https://github.com/matrix-org/matrix-rust-sdk/pull/6514))
 - Add a list of `declined_by: Vec<String>` to the `TimelineItemContent::RtcNotification`, this will contain the list
   of users that have declined the call.
   ([#6494](https://github.com/matrix-org/matrix-rust-sdk/pull/6494))

bindings/matrix-sdk-ffi/src/qr_code.rs

@@ -423,7 +423,7 @@ pub enum HumanQrGrantLoginError {
     NotFound,
 
     /// An unknown error has happened.
-    #[error("An unknown error has happened.")]
+    #[error("An unknown error has happened: {0}")]
     Unknown(String),
 
     /// The requested device was not returned by the homeserver.