Pin the editor highlight overlay to the textarea so long confs scroll to the end

Plugin/unraid/pages/scheduler.php

@@ -1172,8 +1172,14 @@ function vvFitRight() {
   const ed = document.getElementById('vv-editor');
   if (ed.style.display !== 'none') {
     const _edH = Math.max(60, contentH - 38) + 'px';
-    document.getElementById('vv-editor-body').style.height = _edH;
+    const _ta  = document.getElementById('vv-editor-body');
+    _ta.style.height = _edH;
     document.getElementById('vv-ln-gutter').style.height   = _edH;
+    // Re-pin the overlay: this just changed the box it has to match, and vvSyncHlOverlay()
+    // does not run on resize. Without this the two drift apart again the moment the window
+    // changes size — see the comment there for what that costs.
+    const _ov = document.getElementById('vv-hl-overlay');
+    if (_ov) _ov.style.height = _ta.clientHeight + 'px';
   }
   const cf = document.getElementById('vv-confform');
   if (cf.style.display !== 'none') {
@@ -3065,6 +3071,23 @@ function vvSyncHlOverlay() {
   const ov = document.getElementById('vv-hl-overlay');
   if (!ov || !document.getElementById('vv-editor').classList.contains('vv-editor-hl')) return;
   const ta = document.getElementById('vv-editor-body');
+
+  // Pin the overlay to the textarea's client box instead of letting it stretch to
+  // #vv-editor-inner. In highlight mode the textarea's text is transparent, so the overlay IS
+  // the visible document, and it is scrolled only by copying ta.scrollTop. That copy is exact
+  // only while both boxes are the same height — and nothing enforced that: vvFitRight() sizes
+  // the textarea to an explicit pixel height while the overlay inherits `top:0; bottom:0` from
+  // a flex:1 parent. When the parent came out taller, the overlay's scrollable range was the
+  // shorter of the two, so it reached its own end while the textarea kept going and the visible
+  // text froze a few lines short of the file. Reported against master.conf: stuck at 1683 of
+  // 1689, and unchanged by expanding or collapsing the job tree, which is what proved it a fixed
+  // offset rather than anything to do with contentH.
+  //
+  // clientHeight, not offsetHeight: it already excludes the horizontal scrollbar the textarea
+  // grows on long conf lines and the overlay never has, which was part of the same mismatch.
+  // With top and bottom both set, an explicit height wins and bottom is ignored.
+  ov.style.height = ta.clientHeight + 'px';
+
   let html = vvHl(ta.value, false) + '\n';
   if (vvFindTerm) {
     html = vvMarkSearchInHtml(html, vvFindTerm, vvFindIdx);