fix: load the pdf.js worker with the Map upsert polyfill

src/js/editcore/app.js

@@ -3765,11 +3765,12 @@ function openEditor(spec, caret) {
         openPv = lockedPv;
         renderLockedLines(ed, para.runs, lockedPv, para, para.box.x);
         singleLine = false;
+        const countable = (s) => s.replace(/[\u200B\u2060\n]/g, '').length;
         const wantChars = para.runs.reduce(
-          (n, r) => n + (r.text ? r.text.length : 0),
+          (n, r) => n + (r.text ? countable(r.text) : 0),
           0
         );
-        const gotChars = ed.textContent.replace(/[\u200B\u2060]/g, '').length;
+        const gotChars = countable(ed.textContent);
         if (wantChars > 0 && gotChars < wantChars * 0.98) {
           ed.textContent = '';
           delete ed.dataset.locked;
@@ -3840,6 +3841,7 @@ function openEditor(spec, caret) {
     pristine: !!spec.para && ed.dataset.locked === '1',
   };
   if (state.editing.pristine) wrap.classList.add('pristine');
+  else if (spec.para) renderPage();
   ed.focus();
   placeCaret(ed, caret?.x, caret?.y);
   const refocus = () => {