(ios) Limit the keyboard dismissal bug fix to ios [11.0, 13.4) because in ios 13.4 Apple fixed the problem.

See ionic-team#533 (comment)

Author: Lindsay-Needs-Sleep

src/ios/CDVWKWebViewEngine.m

@@ -408,12 +408,18 @@ - (void)pluginInitialize
      selector:@selector(onSocketError:)
      name:@"socketInUseError" object:nil];
 
+    // If greater than 11
     if (@available(iOS 11.0, *)) {
-        // For keyboard dismissal leaving viewport shifted (can potentially be removed when apple releases the fix for the issue discussed here: https://github.com/apache/cordova-ios/issues/417#issuecomment-423340885)
-        [[NSNotificationCenter defaultCenter]
-         addObserver:self
-         selector:@selector(keyboardWillHide)
-         name:UIKeyboardWillHideNotification object:nil];
+        // And less than 13.4
+        if (@available(iOS 13.4, *)) {} else {
+            // For keyboard dismissal leaving viewport shifted 
+            // Can potentially be removed when apple releases the fix for the issue discussed here: https://github.com/apache/cordova-ios/issues/417#issuecomment-423340885
+            // Apple has released a fix in 13.4, but not in 12.x (as of 12.4.6)
+            [[NSNotificationCenter defaultCenter]
+            addObserver:self
+            selector:@selector(keyboardWillHide)
+            name:UIKeyboardWillHideNotification object:nil];
+        }
     }
 
     NSLog(@"Using Ionic WKWebView");