Message editing (#298)

* Add translation for editing mode

* Add `is_editable` flag to timeline item

* Add edit api implementation

* Add edit context menu action

* Add changelog

* Update Rust package

* Add isEditable into video timeline item

* Fix cyclomatic complexity

* Fix video item thumbnail loading

* Fix not updating timeline layout

ElementX/Sources/Screens/RoomScreen/RoomScreenViewModel.swift

@@ -106,6 +106,8 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
             MXLog.warning("React with \(key) failed. Not implemented.")
         case .cancelReply:
             state.composerMode = .default
+        case .cancelEdit:
+            state.composerMode = .default
         }
     }
 
@@ -139,6 +141,8 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         switch currentComposerState {
         case .reply(let itemId, _):
             await timelineController.sendReply(currentMessage, to: itemId)
+        case .edit(let originalItemId):
+            await timelineController.editMessage(currentMessage, of: originalItemId)
         default:
             await timelineController.sendMessage(currentMessage)
         }
@@ -163,15 +167,19 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
     
     private func contextMenuActionsForItemId(_ itemId: String) -> TimelineItemContextMenuActions {
         guard let timelineItem = timelineController.timelineItems.first(where: { $0.id == itemId }),
-              timelineItem is EventBasedTimelineItemProtocol else {
+              let item = timelineItem as? EventBasedTimelineItemProtocol else {
             return .init(actions: [])
         }
         
         var actions: [TimelineItemContextMenuAction] = [
             .copy, .quote, .copyPermalink, .reply
         ]
+
+        if item.isEditable {
+            actions.append(.edit)
+        }
         
-        if let item = timelineItem as? EventBasedTimelineItemProtocol, item.isOutgoing {
+        if item.isOutgoing {
             actions.append(.redact)
         }
         
@@ -187,6 +195,10 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
         switch action {
         case .copy:
             UIPasteboard.general.string = item.text
+        case .edit:
+            state.bindings.composerFocused = true
+            state.bindings.composerText = item.text
+            state.composerMode = .edit(originalItemId: item.id)
         case .quote:
             state.bindings.composerFocused = true
             state.bindings.composerText = "> \(item.text)"
@@ -208,10 +220,7 @@ class RoomScreenViewModel: RoomScreenViewModelType, RoomScreenViewModelProtocol
             state.bindings.debugInfo = .init(title: "Timeline item", content: debugDescription)
         }
         
-        switch action {
-        case .reply:
-            break
-        default:
+        if action.switchToDefaultComposer {
             state.composerMode = .default
         }
     }