context menu: fix go back removing context menu ?

static/contextmenu.js

@@ -1,25 +1,33 @@
 (function() {
-  if (window._contextMenuInitialized) return;
-  window._contextMenuInitialized = true;
-
   const menu = document.createElement('helo');
+
   menu.innerHTML = `
-  <helo-content>
-  <img src="/static/assets/gifs/helo.gif"/>
-  </helo-content>
+    <helo-content>
+      <img src="/static/assets/gifs/helo.gif"/>
+    </helo-content>
   `;
+
   menu.style.display = 'none';
-  document.body.appendChild(menu);
+
+  function ensureMenu() {
+    if (!document.body.contains(menu)) {
+      document.body.appendChild(menu);
+    }
+  }
 
   const showMenu = (x, y) => {
+    ensureMenu();
+
     menu.style.display = 'block';
     menu.style.left = `${x}px`;
     menu.style.top = `${y}px`;
 
     const rect = menu.getBoundingClientRect();
+
     if (x + rect.width > window.innerWidth) {
       menu.style.left = `${window.innerWidth - rect.width - 10}px`;
     }
+
     if (y + rect.height > window.innerHeight) {
       menu.style.top = `${window.innerHeight - rect.height - 10}px`;
     }
@@ -32,12 +40,14 @@
   document.addEventListener('contextmenu', (e) => {
     e.preventDefault();
     showMenu(e.clientX, e.clientY);
-  }, false);
+  });
 
   document.addEventListener('click', hideMenu);
   document.addEventListener('scroll', hideMenu);
+
   document.addEventListener('keydown', (e) => {
     if (e.key === 'Escape') hideMenu();
   });
 
-})();
+  document.body.addEventListener('htmx:historyRestore', ensureMenu);
+})();