Don't restore keyboard after CVC message context menu if the menu item presented a VC.

Signal/src/ViewControllers/ConversationView/ConversationViewController+MessageActions.swift

@@ -323,10 +323,17 @@ extension ConversationViewController: ContextMenuInteractionDelegate {
         if let contextInteraction = interaction as? ChatHistoryContextMenuInteraction, let cell = contextInteraction.view as? CVCell, let componentView = cell.componentView {
             componentView.contextMenuPresentationDidEnd?()
 
+            // Restore the keyboard unless the context menu item presented
+            // a view controller.
             if contextInteraction.keyboardWasActive {
-                popKeyBoard()
+                if self.presentedViewController == nil {
+                    popKeyBoard()
+                } else {
+                    // If we're not going to restore the keyboard, update
+                    // chat history layout.
+                    self.loadCoordinator.enqueueReload()
+                }
             }
-
         }
 
         collectionViewActiveContextMenuInteraction = nil

Signal/src/ViewControllers/ConversationView/ConversationViewController+MessageActionsDelegate.swift

@@ -81,6 +81,8 @@ extension ConversationViewController: MessageActionsDelegate {
     }
 
     func messageActionsForwardItem(_ itemViewModel: CVItemViewModelImpl) {
+        AssertIsOnMainThread()
+
         ForwardMessageViewController.present(forItemViewModels: [itemViewModel],
                                              from: self,
                                              delegate: self)

Signal/src/ViewControllers/ConversationView/ConversationViewController+Selection.swift

@@ -362,6 +362,8 @@ extension ConversationViewController {
     }
 
     func didTapForwardSelectedItems() {
+        AssertIsOnMainThread()
+
         let selectionItems = self.selectionState.selectionItems
         guard !selectionItems.isEmpty else {
             owsFailDebug("Invalid selection.")