reload input bar async

Signal/src/ViewControllers/ConversationView/ConversationInputToolbar.m

@@ -13,6 +13,7 @@
 #import "UIView+OWS.h"
 #import "ViewControllerUtils.h"
 #import <SignalMessaging/OWSFormat.h>
+#import <SignalMessaging/SignalMessaging-Swift.h>
 #import <SignalServiceKit/NSTimer+OWS.h>
 #import <SignalServiceKit/TSQuotedMessage.h>
 
@@ -221,11 +222,17 @@ const CGFloat kMaxTextViewHeight = 98;
     // Momentarily switch to a non-default keyboard, else reloadInputViews
     // will not affect the displayed keyboard. In practice this isn't perceptable to the user.
     // The alternative would be to dismiss-and-pop the keyboard, but that can cause a more pronounced animation.
-    self.inputTextView.keyboardType = UIKeyboardTypeNumbersAndPunctuation;
-    [self.inputTextView reloadInputViews];
-
-    self.inputTextView.keyboardType = UIKeyboardTypeDefault;
-    [self.inputTextView reloadInputViews];
+    //
+    // This is surprisingly expensive (~5ms), so we do it async, *after* the message is rendered.
+    dispatch_async(dispatch_get_main_queue(), ^{
+        [BenchManager benchWithTitle:@"toggleDefaultKeyboard" block:^{
+            self.inputTextView.keyboardType = UIKeyboardTypeNumbersAndPunctuation;
+            [self.inputTextView reloadInputViews];
+
+            self.inputTextView.keyboardType = UIKeyboardTypeDefault;
+            [self.inputTextView reloadInputViews];
+        }];
+    });
 }
 
 - (void)setQuotedReply:(nullable OWSQuotedReplyModel *)quotedReply