Keep editor open across in-site navigation, retargeting to the new page

load() closed the editor on every navigation, and the close raced the
navigation: the shell's close-time loadPlain re-render resolved last,
swapping the old page back in and replaceStating its URL. Navigation now
leaves the panel open and the existing pagerite:switch-editor retarget
fires while editing; the exception is /_a, where closeEditor({ navigating:
true }) closes the panel without the re-swap or title restore.

frontend/src/EditorShell.vue

@@ -44,11 +44,13 @@ function openShell() {
     editorLang.value = session
   pinPreviewLang()
 }
-function unpinPreviewLang() {
+function unpinPreviewLang(ev) {
   if (!pinned) return
   pinned = false
   setLangOverride(null)
-  loadPlain(currentPath.value)
+  // A close caused by navigation (to /_a) must not re-render the page the
+  // editor was on: the navigation itself is swapping in the target page.
+  if (!ev?.detail?.navigating) loadPlain(currentPath.value)
 }
 watch(editorLang, () => { if (pinned) pinPreviewLang() })
 // The page's primary may be (re)learned while pinned on it (doc accept,

frontend/src/main.js

@@ -125,7 +125,11 @@ function showEditor() {
   dispatchEvent(new CustomEvent('pagerite:editor-shown'))
 }
 
-export function closeEditor() {
+// navigating: the close is part of a fetch-navigation (to /_a) — the shell
+// must not re-swap the page it was previewing back in, and the navigation
+// itself sets the new title, so both the unpin re-render and the title
+// restore are skipped.
+export function closeEditor({ navigating = false } = {}) {
   if (!visible) return
   visible = false
   stopTrackingPanel()
@@ -136,7 +140,8 @@ export function closeEditor() {
   host.firstElementChild?.classList.add('closing')
   const h = host
   setTimeout(() => { h.style.display = 'none' }, 250)
-  dispatchEvent(new CustomEvent('pagerite:editor-hidden'))
+  dispatchEvent(new CustomEvent('pagerite:editor-hidden', { detail: { navigating } }))
+  if (navigating) return
   // The editor may have dropped the prefetch cache; warm it again for the
   // now-final page so navigation stays instant.
   dispatchEvent(new CustomEvent('pagerite:preload-pages'))

frontend/src/pagerite.js

@@ -843,13 +843,16 @@ import { reconnectPolicy, socketSlot, watchConnecting } from "./reconnect";
 
   // --- Fetch navigation ------------------------------------------------
   async function load(url, push = true, back = false) {
-    // Navigating with the editor open closes it; unsaved edits are lost
-    // (the region swap discards the previewed changes anyway). Cache must be
-    // bypassed for this navigation because the editor may have invalidated
-    // the prefetched copies of other pages.
+    // Navigating with the editor open keeps it open: the shell retargets to
+    // the new page once the swap lands (below). The exception is /_a
+    // (analytics), where the panel does not apply — close it there, with
+    // navigating: true so the close does not re-swap/re-title the page it
+    // was previewing (this navigation is already swapping). The cache is
+    // bypassed while editing because the editor may have invalidated the
+    // prefetched copies of other pages.
     const editing = document.body.classList.contains("editing");
-    if (editing) {
-      editorModule?.then((m) => m.closeEditor());
+    if (editing && new URL(url, location.href).pathname === "/_a") {
+      await editorModule?.then((m) => m.closeEditor({ navigating: true }));
     }
     teardownAnalytics();
     let doc;
@@ -936,7 +939,11 @@ import { reconnectPolicy, socketSlot, watchConnecting } from "./reconnect";
       // own lang="en" dir="ltr", so it is unaffected).
       document.documentElement.lang = doc.documentElement.lang;
       document.documentElement.dir = doc.documentElement.dir;
+      // The editor keeps its own title while open (the retargeted tab
+      // re-applies it); only inherit the server title when not editing.
+      if (!document.body.classList.contains("editing")) {
         document.title = doc.title;
+      }
       // Banners may contain scripts (canvas etc.), content pages may too.
       runScripts(document.getElementById("page-banner"));
       runScripts(document.getElementById("main"));