Views presented from ConversationVC must become first responder.

// FREEBIE

Signal/src/ViewControllers/MediaGalleryViewController.swift

@@ -220,6 +220,21 @@ class MediaGalleryViewController: UINavigationController, MediaGalleryDataSource
         fatalError("init(coder:) has not been implemented")
     }
 
+    override var canBecomeFirstResponder: Bool {
+        Logger.debug("\(self.logTag) in \(#function)")
+        return true
+    }
+
+    override public func becomeFirstResponder() -> Bool {
+        Logger.debug("\(self.logTag) in \(#function)")
+        return super.becomeFirstResponder()
+    }
+
+    override public func resignFirstResponder() -> Bool {
+        Logger.debug("\(self.logTag) in \(#function)")
+        return super.resignFirstResponder()
+    }
+
     // MARK: View Lifecyle
 
     override func viewDidLoad() {
@@ -296,7 +311,7 @@ class MediaGalleryViewController: UINavigationController, MediaGalleryDataSource
         self.applyInitialMediaViewConstraints()
 
         // Restore presentationView.alpha in case a previous dismiss left us in a bad state.
-        pageViewController.navigationController?.setNavigationBarHidden(false, animated: false)
+        self.setNavigationBarHidden(false, animated: false)
         self.presentationView.alpha = 1
 
         // We want to animate the tapped media from it's position in the previous VC
@@ -362,6 +377,15 @@ class MediaGalleryViewController: UINavigationController, MediaGalleryDataSource
                             self.view.isUserInteractionEnabled = true
 
                             pageViewController.wasPresented()
+
+                            // Since we're presenting *over* the ConversationVC, we need to `becomeFirstResponder`.
+                            //
+                            // Otherwise, the `ConversationVC.inputAccessoryView` will appear over top of us whenever
+                            // OWSWindowManager window juggling calls `[rootWindow makeKeyAndVisible]`.
+                            //
+                            // We don't need to do this when pushing VCs onto the SignalsNavigationController - only when
+                            // presenting directly from ConversationVC.
+                            _ = self.becomeFirstResponder()
             })
         }
     }

Signal/src/util/OWSWindowManager.m

@@ -346,8 +346,8 @@ const UIWindowLevel UIWindowLevel_ScreenBlocking(void)
     }
 
     // By calling makeKeyAndVisible we ensure the rootViewController becomes firt responder.
-    // In the normal case, that means the SignalViewController will call `becomeFirstResponder` on the vc on top of it's
+    // In the normal case, that means the SignalViewController will call `becomeFirstResponder`
-    // navigation stack.
+    // on the vc on top of its navigation stack.
     [self.rootWindow makeKeyAndVisible];
 
 }