Fix crash when removing the same poll option multiple times

SwiftUI doesn't detect updates to CoreData objects when directly
mutating the NSMutableOrderedSet of a relationship

Closes #458

Packages/ComposeUI/Sources/ComposeUI/Controllers/PollController.swift

@@ -34,11 +34,16 @@ class PollController: ViewController {
     }
     
     private func moveOptions(indices: IndexSet, newIndex: Int) {
-        poll.options.moveObjects(at: indices, to: newIndex)
+        // see AttachmentsListController.moveAttachments
+        var array = poll.pollOptions
+        array.move(fromOffsets: indices, toOffset: newIndex)
+        poll.options = NSMutableOrderedSet(array: array)
     }
     
     private func removeOption(_ option: PollOption) {
-        poll.options.remove(option)
+        var array = poll.pollOptions
+        array.remove(at: poll.options.index(of: option))
+        poll.options = NSMutableOrderedSet(array: array)
     }
     
     private var canAddOption: Bool {

Packages/ComposeUI/Sources/ComposeUI/Views/EmojiTextField.swift

@@ -52,6 +52,11 @@ struct EmojiTextField: UIViewRepresentable {
         if text != uiView.text {
             uiView.text = text
         }
+        if placeholder != uiView.attributedPlaceholder?.string {
+            uiView.attributedPlaceholder = NSAttributedString(string: placeholder, attributes: [
+                .foregroundColor: UIColor.secondaryLabel,
+            ])
+        }
         
         context.coordinator.text = $text
         context.coordinator.maxLength = maxLength