Adjust scrollToLocation when using sticky section headers (#24735)

Summary:
When using `scrollToLocation` together with `stickySectionHeadersEnabled` in a `SectionList`, the length of the section header is not accounted for when scrolling to any item except the header.

[General] [Fixed] - Adjust scrollToLocation when using sticky section headers
Pull Request resolved: #24735

Differential Revision: D15240953

Pulled By: cpojer

fbshipit-source-id: fd7121d990c5b01533e456bdfa39bebf6245fa80

Author: danilobuerger

Libraries/Lists/VirtualizedSectionList.js

@@ -149,8 +149,16 @@ class VirtualizedSectionList<
     for (let i = 0; i < params.sectionIndex; i++) {
       index += this.props.getItemCount(this.props.sections[i].data) + 2;
     }
+    let viewOffset = 0;
+    if (params.itemIndex > 0 && this.props.stickySectionHeadersEnabled) {
+      const frame = this._listRef._getFrameMetricsApprox(
+        index - params.itemIndex,
+      );
+      viewOffset = frame.length;
+    }
     const toIndexParams = {
       ...params,
+      viewOffset,
       index,
     };
     this._listRef.scrollToIndex(toIndexParams);