From 931ce89842bfd22a7cdb4cef51116fdbd3830633 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miko=C5=82aj=20Trzci=C5=84ski?=
 <mtrzcinski@internships.svevn.com>
Date: Wed, 25 Sep 2024 08:28:25 +0200
Subject: [PATCH] [#66130] add function for checking previous elements

---
 src/extensions/syncDualPane.js | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/src/extensions/syncDualPane.js b/src/extensions/syncDualPane.js
index 567e99d..022dd92 100644
--- a/src/extensions/syncDualPane.js
+++ b/src/extensions/syncDualPane.js
@@ -56,15 +56,11 @@ export function handlePreviewClickToScroll(/** @type {{ target: HTMLElement }} *
   let id = ev.target.getAttribute("data-line-id");
   let elem = ev.target;
   if (!id) {
-    // check parents
-    outer: while (elem.tagName !== "HTML-CHUNK") {
+    // check parents and siblings
+    while (elem.tagName !== "HTML-CHUNK") {
       const parent = elem.parentElement;
-      // check siblings
-      while (elem != null) {
-        id = elem.getAttribute("data-line-id");
-        if (id) break outer;
-        elem = elem.previousElementSibling;
-      }
+      [id, elem] = findSoruceMappedPreviousElement(elem);
+      if (id) break;
       elem = parent;
     }
   }
@@ -102,3 +98,14 @@ export function handlePreviewClickToScroll(/** @type {{ target: HTMLElement }} *
     setCursor();
   }
 }
+
+function findSoruceMappedPreviousElement(startingElem) {
+  let elem = startingElem;
+  while (elem != null) {
+    const id = elem.getAttribute("data-line-id");
+    if (id) return [id, elem];
+    elem = elem.previousElementSibling;
+  }
+
+  return [undefined, elem];
+}