Fix various issues when dealing with multiple Compose/Drafts screens simultaneously

Packages/ComposeUI/Sources/ComposeUI/Controllers/ComposeController.swift

@@ -10,6 +10,7 @@ import Combine
 import Pachyderm
 import TuskerComponents
 import MatchedGeometryPresentation
+import CoreData
 
 public final class ComposeController: ViewController {
     public typealias FetchAttachment = (URL) async  -> UIImage?
@@ -54,6 +55,9 @@ public final class ComposeController: ViewController {
     @Published public private(set) var didPostSuccessfully = false
     @Published var hasChangedLanguageSelection = false
     
+    private var isDisappearing = false
+    private var userConfirmedDelete = false
+    
     var isPosting: Bool {
         poster != nil
     }
@@ -119,6 +123,7 @@ public final class ComposeController: ViewController {
         if #available(iOS 16.0, *) {
             NotificationCenter.default.addObserver(self, selector: #selector(currentInputModeChanged), name: UITextInputMode.currentInputModeDidChangeNotification, object: nil)
         }
+        NotificationCenter.default.addObserver(self, selector: #selector(managedObjectsDidChange), name: .NSManagedObjectContextObjectsDidChange, object: DraftsPersistentContainer.shared.viewContext)
     }
     
     public var view: some View {
@@ -129,6 +134,15 @@ public final class ComposeController: ViewController {
             .environment(\.composeUIConfig, config)
     }
     
+    @MainActor
+    @objc private func managedObjectsDidChange(_ notification: Foundation.Notification) {
+        if let deleted = notification.userInfo?[NSDeletedObjectsKey] as? Set<NSManagedObject>,
+           deleted.contains(where: { $0.objectID == self.draft.objectID }),
+           !isDisappearing {
+            self.config.dismiss(.cancel)
+        }
+    }
+    
     public func canPaste(itemProviders: [NSItemProvider]) -> Bool {
         guard itemProviders.allSatisfy({ $0.canLoadObject(ofClass: DraftAttachment.self) }) else {
             return false
@@ -172,6 +186,7 @@ public final class ComposeController: ViewController {
     @MainActor
     func cancel(deleteDraft: Bool) {
         deleteDraftOnDisappear = true
+        userConfirmedDelete = true
         config.dismiss(.cancel)
     }
     
@@ -216,16 +231,18 @@ public final class ComposeController: ViewController {
     }
     
     func selectDraft(_ newDraft: Draft) {
-        if !self.draft.hasContent {
-            DraftsPersistentContainer.shared.viewContext.delete(self.draft)
+        let oldDraft = self.draft
+        self.draft = newDraft
+        
+        if !oldDraft.hasContent {
+            DraftsPersistentContainer.shared.viewContext.delete(oldDraft)
         }
         DraftsPersistentContainer.shared.save()
-        
-        self.draft = newDraft
     }
     
     func onDisappear() {
-        if deleteDraftOnDisappear && (!draft.hasContent || didPostSuccessfully) {
+        isDisappearing = true
+        if deleteDraftOnDisappear && (!draft.hasContent || didPostSuccessfully || userConfirmedDelete) {
             DraftsPersistentContainer.shared.viewContext.delete(draft)
         }
         DraftsPersistentContainer.shared.save()

Packages/ComposeUI/Sources/ComposeUI/Controllers/DraftsController.swift

@@ -7,6 +7,7 @@
 
 import SwiftUI
 import TuskerComponents
+import CoreData
 
 class DraftsController: ViewController {
     
@@ -152,11 +153,13 @@ private struct DraftRow: View {
             
             Spacer()
             
-            Text(draft.lastModified.formatted(.abbreviatedTimeAgo))
+            if let lastModified = draft.lastModified {
+                Text(lastModified.formatted(.abbreviatedTimeAgo))
                     .font(.body)
                     .foregroundColor(.secondary)
             }
         }
+    }
 }
 
 private extension View {

Packages/ComposeUI/Sources/ComposeUI/Controllers/FocusedAttachmentController.swift

@@ -108,7 +108,7 @@ private struct DismissFocusedAttachmentButtonStyle: ButtonStyle {
 }
 
 struct AttachmentDescriptionTextViewID: Hashable {
-    let attachmentID: UUID
+    let attachmentID: UUID!
     
     init(_ attachment: DraftAttachment) {
         self.attachmentID = attachment.id

Packages/ComposeUI/Sources/ComposeUI/CoreData/Draft.swift

@@ -28,7 +28,7 @@ public class Draft: NSManagedObject, Identifiable {
     @NSManaged public var initialText: String
     @NSManaged public var inReplyToID: String?
     @NSManaged public var language: String? // ISO 639 language code
-    @NSManaged public var lastModified: Date
+    @NSManaged public var lastModified: Date!
     @NSManaged public var localOnly: Bool
     @NSManaged public var text: String
     @NSManaged private var visibilityStr: String

Packages/ComposeUI/Sources/ComposeUI/CoreData/DraftAttachment.swift

@@ -26,7 +26,7 @@ public final class DraftAttachment: NSManagedObject, Identifiable {
     @NSManaged public var editedAttachmentURL: URL?
     @NSManaged public var fileURL: URL?
     @NSManaged internal var fileType: String?
-    @NSManaged public var id: UUID
+    @NSManaged public var id: UUID!
     
     @NSManaged internal var draft: Draft
     

Packages/ComposeUI/Sources/ComposeUI/Views/PollOptionView.swift

@@ -18,10 +18,6 @@ struct PollOptionView: View {
         self.remove = remove
     }
     
-    private var optionIndex: Int {
-        poll.options.index(of: option)
-    }
-    
     var body: some View {
         HStack(spacing: 4) {
             Checkbox(radiusFraction: poll.multiple ? 0.1 : 0.5, background: controller.parent.config.backgroundColor)
@@ -41,7 +37,8 @@ struct PollOptionView: View {
     }
     
     private var textField: some View {
-        let placeholder = "Option \(optionIndex + 1)"
+        let index = poll.options.index(of: option)
+        let placeholder = index != NSNotFound ? "Option \(index + 1)" : ""
         let maxLength = controller.parent.mastodonController.instanceFeatures.maxPollOptionChars
         return EmojiTextField(text: $option.text, placeholder: placeholder, maxLength: maxLength)
     }