Handle task cancellation in MastodonController.run

Tusker/API/MastodonController.swift

@@ -68,7 +68,7 @@ class MastodonController: ObservableObject {
     }
     
     func run<Result>(_ request: Request<Result>) async throws -> (Result, Pagination?) {
-        return try await withCheckedThrowingContinuation({ continuation in
+        let result: (Result, Pagination?) = try await withCheckedThrowingContinuation({ continuation in
             client.run(request) { response in
                 switch response {
                 case .failure(let error):
@@ -78,6 +78,8 @@ class MastodonController: ObservableObject {
                 }
             }
         })
+        try Task.checkCancellation()
+        return result
     }
     
     /// - Returns: A tuple of client ID and client secret.

Tusker/TimelineLikeController.swift

@@ -65,6 +65,8 @@ actor TimelineLikeController<Item> {
             await loadingIndicator.end()
             await emit(event: .replaceAllItems(items, token))
             state = .idle
+        } catch is CancellationError {
+            return
         } catch {
             await loadingIndicator.end()
             await emit(event: .loadAllError(error, token))
@@ -85,6 +87,8 @@ actor TimelineLikeController<Item> {
             }
             await emit(event: .prependItems(items, token))
             state = .idle
+        } catch is CancellationError {
+            return
         } catch {
             await emit(event: .loadNewerError(error, token))
             state = .idle
@@ -113,6 +117,8 @@ actor TimelineLikeController<Item> {
             await loadingIndicator.end()
             await emit(event: .appendItems(items, token))
             state = .idle
+        } catch is CancellationError {
+            return
         } catch {
             await loadingIndicator.end()
             await emit(event: .loadOlderError(error, token))