fix(content): add an internal method to recalculate dimensions

Author: brandyscarney

core/src/components.d.ts

@@ -868,6 +868,10 @@ export namespace Components {
           * Get the element where the actual scrolling takes place. This element can be used to subscribe to `scroll` events or manually modify `scrollTop`. However, it's recommended to use the API provided by `ion-content`:  i.e. Using `ionScroll`, `ionScrollStart`, `ionScrollEnd` for scrolling events and `scrollToPoint()` to scroll the content into a certain point.
          */
         "getScrollElement": () => Promise<HTMLElement>;
+        /**
+          * Recalculate content dimensions. Called by overlays (e.g., popover) when sibling elements like headers or footers have finished rendering and their heights are available, ensuring accurate offset-top calculations.
+         */
+        "recalculateDimensions": () => Promise<void>;
         /**
           * Scroll by a specified X/Y distance in the component.
           * @param x The amount to scroll by on the horizontal axis.

core/src/components/content/content.tsx

@@ -254,6 +254,17 @@ export class Content implements ComponentInterface {
     }
   }
 
+  /**
+   * Recalculate content dimensions. Called by overlays (e.g., popover) when
+   * sibling elements like headers or footers have finished rendering and their
+   * heights are available, ensuring accurate offset-top calculations.
+   * @internal
+   */
+  @Method()
+  async recalculateDimensions(): Promise<void> {
+    readTask(() => this.readDimensions());
+  }
+
   private readDimensions() {
     const page = getPageElement(this.el);
     const top = Math.max(this.el.offsetTop, 0);