Keyboard height not detectable with WebView

This issue is also recently posted to the Qt forums: https://forum.qt.io/topic/95626/impossible-to-detect-keyboard-visibility-size-when-using-webview-on-android

When using a webview with input fields, the keyboard shows up but is not recognized by the Qt Input Method. It is not detected as visible and the keyboardRectangle returns 0 height.

Therefore it seems to be impossible to react to the opening keyboard when using a webview.