fix: /context for element android. start and end must be set even with limit=0

src/api/client_server/context.rs

@@ -103,7 +103,10 @@ pub async fn get_context_route(
         }
     }
 
-    let start_token = events_before.last().map(|(count, _)| count.stringify());
+    let start_token = events_before
+        .last()
+        .map(|(count, _)| count.stringify())
+        .unwrap_or_else(|| base_token.stringify());
 
     let events_before: Vec<_> = events_before
         .into_iter()
@@ -156,7 +159,10 @@ pub async fn get_context_route(
         .state_full_ids(shortstatehash)
         .await?;
 
-    let end_token = events_after.last().map(|(count, _)| count.stringify());
+    let end_token = events_after
+        .last()
+        .map(|(count, _)| count.stringify())
+        .unwrap_or_else(|| base_token.stringify());
 
     let events_after: Vec<_> = events_after
         .into_iter()
@@ -193,8 +199,8 @@ pub async fn get_context_route(
     }
 
     let resp = get_context::v3::Response {
-        start: start_token,
-        end: end_token,
+        start: Some(start_token),
+        end: Some(end_token),
         events_before,
         event: Some(base_event),
         events_after,

src/api/server_server.rs

@@ -1,4 +1,5 @@
-#[allow(deprecated)]
+#![allow(deprecated)]
+
 use crate::{
     api::client_server::{self, claim_keys_helper, get_keys_helper},
     service::pdu::{gen_event_id_canonical_json, PduBuilder},

src/service/rooms/threads/mod.rs

@@ -1,18 +1,15 @@
 mod data;
-use std::sync::Arc;
 
 pub use data::Data;
 use ruma::{
     api::client::{error::ErrorKind, threads::get_threads::v1::IncludeThreads},
-    events::{relation::BundledThread, StateEventType},
-    uint, CanonicalJsonValue, EventId, OwnedUserId, RoomId, UserId,
+    events::relation::BundledThread,
+    uint, CanonicalJsonValue, EventId, RoomId, UserId,
 };
-use serde::Deserialize;
+
 use serde_json::json;
 
-use crate::{services, utils, Error, PduEvent, Result};
-
-use super::timeline::PduCount;
+use crate::{services, Error, PduEvent, Result};
 
 pub struct Service {
     pub db: &'static dyn Data,

src/service/rooms/timeline/mod.rs

@@ -24,7 +24,7 @@ use ruma::{
         GlobalAccountDataEventType, StateEventType, TimelineEventType,
     },
     push::{Action, Ruleset, Tweak},
-    serde::{Base64, JsonObject},
+    serde::Base64,
     state_res,
     state_res::{Event, RoomVersion},
     uint, user_id, CanonicalJsonObject, CanonicalJsonValue, EventId, OwnedEventId, OwnedRoomId,