When an external application returns to the flutter application while the ios soft keyboard is turned on, the app will appear a short white splash screen, and the height of the splash screen is the height of the ios soft keyboard. This phenomenon appeared when I tested many flutter apps.

Steps to Reproduce

1. Run my flutter app in my iphone Successful.
2. Open a external application which can open Apple's soft keyboard
3. Bring up the keybord
   4.back my flutter app

Actual results

It will appear white screen. and white screen's height is same as the soft keyboard .
This bug will not appear in Android.