Fixes #978 - Message forwarding support

* Add support for message forwarding

* Move the TimelineProvider within the RoomProxy to avoid it going out of sync and have it automatically register for timeline updates on init

* Implement single selection form button style for message forwarding

* Add searching and filter out the source room from the list

* Fixed emoji screen initial search bar height

* Add view models tests

* Add changelog

* Update strings

* Tweaks following code review

ElementX/Sources/Screens/RoomScreen/RoomScreenCoordinator.swift

@@ -32,6 +32,7 @@ enum RoomScreenCoordinatorAction {
     case presentRoomDetails
     case presentEmojiPicker(itemID: String)
     case presentRoomMemberDetails(member: RoomMemberProxyProtocol)
+    case presentMessageForwarding(itemID: String)
 }
 
 final class RoomScreenCoordinator: CoordinatorProtocol {
@@ -54,6 +55,7 @@ final class RoomScreenCoordinator: CoordinatorProtocol {
     
     // MARK: - Public
     
+    // swiftlint:disable:next cyclomatic_complexity
     func start() {
         viewModel.callback = { [weak self] action in
             guard let self else { return }
@@ -77,6 +79,8 @@ final class RoomScreenCoordinator: CoordinatorProtocol {
                 actionsSubject.send(.presentMediaUploadPreviewScreen(url))
             case .displayRoomMemberDetails(let member):
                 actionsSubject.send(.presentRoomMemberDetails(member: member))
+            case .displayMessageForwarding(let itemID):
+                actionsSubject.send(.presentMessageForwarding(itemID: itemID))
             }
         }
     }

ElementX/Sources/Screens/RoomScreen/RoomScreenModels.swift

@@ -28,6 +28,7 @@ enum RoomScreenViewModelAction {
     case displayDocumentPicker
     case displayMediaUploadPreviewScreen(url: URL)
     case displayRoomMemberDetails(member: RoomMemberProxyProtocol)
+    case displayMessageForwarding(itemID: String)
 }
 
 enum RoomScreenComposerMode: Equatable {

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -330,12 +330,14 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         }
         
         var actions: [TimelineItemMenuAction] = [
-            .reply, .copyPermalink
+            .reply
         ]
         
         if timelineItem is EventBasedMessageTimelineItemProtocol {
-            actions.append(contentsOf: [.copy, .quote])
+            actions.append(contentsOf: [.forward(itemID: itemId), .copy, .quote])
         }
+        
+        actions.append(.copyPermalink)
 
         if item.isEditable {
             actions.append(.edit)
@@ -403,6 +405,8 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
             let replyDetails = TimelineItemReplyDetails.loaded(sender: eventTimelineItem.sender, contentType: buildReplyContent(for: eventTimelineItem))
             
             state.composerMode = .reply(itemID: eventTimelineItem.id, replyDetails: replyDetails)
+        case .forward(let itemID):
+            callback?(.displayMessageForwarding(itemID: itemID))
         case .viewSource:
             let debugInfo = timelineController.debugInfo(for: eventTimelineItem.id)
             MXLog.info(debugInfo)

ElementX/Sources/Screens/RoomScreen/View/TimelineItemMenu.swift

@@ -37,6 +37,7 @@ enum TimelineItemMenuAction: Identifiable, Hashable {
     case copyPermalink
     case redact
     case reply
+    case forward(itemID: String)
     case viewSource
     case retryDecryption(sessionID: String)
     case report
@@ -193,6 +194,10 @@ public struct TimelineItemMenu: View {
                 Button { send(action) } label: {
                     MenuLabel(title: L10n.actionReply, systemImageName: "arrowshape.turn.up.left")
                 }
+            case .forward:
+                Button { send(action) } label: {
+                    MenuLabel(title: L10n.actionForward, systemImageName: "arrowshape.turn.up.right")
+                }
             case .redact:
                 Button(role: .destructive) { send(action) } label: {
                     MenuLabel(title: L10n.actionRemove, systemImageName: "trash")