fix the problem that unity ios portrait to landscape display uncorrectly with black area issue description: 1.https://issuetracker.unity3d.com/issues/ios-crash-in-unityrepaint-when-resuming-the-app-with-different-landscape-orientation-if-running-at-60-fps 2.https://issuetracker.unity3d.com/issues/ios-changing-the-screen-orientation-via-a-script-sometimes-results-in-corrupted-view-on-ios-10
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