test a fix

core/src/utils/input-shims/hacks/scroll-assist.ts

@@ -59,6 +59,12 @@ export const enableScrollAssist = (
    */
   let platformHeight = win !== undefined ? win.innerHeight : 0;
 
+  /**
+   * The initial platform height is used to determine the platform
+   * height when the webview is fullscreen/the keyboard is closed.
+   */
+  const initialPlatformHeight = platformHeight;
+
   /**
    * Scroll assist is run when a text field
    * is focused. However, it may need to
@@ -81,6 +87,13 @@ export const enableScrollAssist = (
   const keyboardShow = (ev: CustomEvent<{ keyboardHeight: number }>) => {
     const { keyboardHeight } = ev.detail;
 
+    /**
+     * platformHeight is recomputed every time the keyboard shows
+     * to account for any device rotations (i.e. rotating from portrait
+     * to landscape). This ensures we are using an accurate platform height.
+     */
+    platformHeight = win !== undefined ? win.innerHeight: 0;
+
     /**
      * If the keyboard has not yet been presented
      * for this text field then the text field has just
@@ -89,33 +102,28 @@ export const enableScrollAssist = (
      */
     if (hasKeyboardBeenPresentedForTextField === false) {
       hasKeyboardBeenPresentedForTextField = true;
-
-      /**
-       * The platform height is the innerHeight of the window
-       * because the webview has not resize yet.
-       */
-      platformHeight = win !== undefined ? win.innerHeight : 0;
       return;
     }
 
-    /**
-     * platformHeight is recomputed every time the keyboard shows
-     * to account for any device rotations (i.e. rotating from portrait
-     * to landscape). This ensures we are using an accurate platform height.
-     *
-     * If we are using the Native keyboard resize behavior and
-     * the keyboard was already shown then the webview has already resized.
-     * In order to compute the correct platform height (before the keyboard was shown)
-     * we need to add the keyboard height to window.innerHeight.
+
+    /*
+     * If we are using the Native keyboard resize behavior then
+     * the webview will resize when the keyboard is shown. However,
+     * this happens asynchronously so the webview is not guaranteed
+     * to have resized by the time the keyboard show event is fired.
+     * If current platform height is NOT equal to the initial platform height
+     * (i.e. the platform height when the keyboard is guaranteed to be closed/the
+     * webview is fullsize) then it's possible that the webview has resized.
+     * In that case we add the keyboard height to get the real platform height (the
+     * height when the keyboard is closed).
      */
-    if (keyboardResize !== undefined && keyboardResize.mode === KeyboardResize.Native) {
-      platformHeight = win !== undefined ? win.innerHeight + keyboardHeight : 0;
-      /**
-       * Otherwise the webview does not resize and we can use window.innerHeight
-       * as we normally would.
-       */
-    } else {
-      platformHeight = win !== undefined ? win.innerHeight : 0;
+    if (
+      keyboardResize !== undefined &&
+      keyboardResize.mode === KeyboardResize.Native &&
+      win !== undefined &&
+      platformHeight !== initialPlatformHeight
+    ) {
+      platformHeight += keyboardHeight;
     }
 
     /**