Fix duplicate headers on HTMX nav, editor content loading, and double mount

- Nest admin header inside post-header-child (layouts.py/helpers.py) so
  full-page DOM matches OOB swap structure, eliminating duplicate headers
- Clear post-header-child on post layout OOB to remove stale admin rows
- Read SX initial content from #sx-content-input instead of
  window.__SX_INITIAL__ to avoid escaping issues through SX pipeline
- Fix client-side SX parser RE_STRING to handle escaped newlines
- Clear root element in SxEditor.mount() to prevent double content on
  HTMX re-mount
- Remove unused ~blog-editor-sx-initial component

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

blog/sx/editor.sx

@@ -55,6 +55,104 @@
       (button :type "submit"
         :class "px-[20px] py-[6px] bg-stone-700 text-white text-[14px] rounded-[8px] hover:bg-stone-800 transition-colors cursor-pointer" create-label))))
 
+;; Edit form — pre-populated version for /<slug>/admin/edit/
+(defcomp ~blog-editor-edit-form (&key csrf updated-at title-val excerpt-val
+                                      feature-image feature-image-caption
+                                      sx-content-val lexical-json
+                                      has-sx title-placeholder
+                                      status already-emailed
+                                      newsletter-options footer-extra)
+  (let* ((sel-cls "text-[14px] rounded-[4px] border border-stone-200 px-[8px] py-[6px] bg-white text-stone-600")
+         (active "px-[12px] py-[6px] text-[13px] font-medium text-stone-700 border-b-2 border-stone-700 cursor-pointer bg-transparent")
+         (inactive "px-[12px] py-[6px] text-[13px] font-medium text-stone-400 border-b-2 border-transparent cursor-pointer bg-transparent hover:text-stone-600"))
+    (form :id "post-edit-form" :method "post" :class "max-w-[768px] mx-auto pb-[48px]"
+      (input :type "hidden" :name "csrf_token" :value csrf)
+      (input :type "hidden" :name "updated_at" :value updated-at)
+      (input :type "hidden" :id "lexical-json-input" :name "lexical" :value "")
+      (input :type "hidden" :id "sx-content-input" :name "sx_content" :value (or sx-content-val ""))
+      (input :type "hidden" :id "feature-image-input" :name "feature_image" :value (or feature-image ""))
+      (input :type "hidden" :id "feature-image-caption-input" :name "feature_image_caption" :value (or feature-image-caption ""))
+      (div :id "feature-image-container" :class "relative mt-[16px] mb-[24px] group"
+        (div :id "feature-image-empty" :class (if feature-image "hidden" "")
+          (button :type "button" :id "feature-image-add-btn"
+            :class "text-[14px] text-stone-400 hover:text-stone-600 transition-colors cursor-pointer"
+            "+ Add feature image"))
+        (div :id "feature-image-filled" :class (str "relative " (if feature-image "" "hidden"))
+          (img :id "feature-image-preview" :src (or feature-image "") :alt ""
+            :class "w-full max-h-[448px] object-cover rounded-[8px] cursor-pointer")
+          (button :type "button" :id "feature-image-delete-btn"
+            :class "absolute top-[8px] right-[8px] w-[32px] h-[32px] rounded-full bg-black/50 text-white flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity hover:bg-black/70 cursor-pointer text-[14px]"
+            :title "Remove feature image"
+            (i :class "fa-solid fa-trash-can"))
+          (input :type "text" :id "feature-image-caption" :value (or feature-image-caption "")
+            :placeholder "Add a caption..."
+            :class "mt-[8px] w-full text-[14px] text-stone-500 bg-transparent border-none outline-none placeholder:text-stone-300 focus:text-stone-700"))
+        (div :id "feature-image-uploading"
+          :class "hidden flex items-center gap-[8px] mt-[8px] text-[14px] text-stone-400"
+          (i :class "fa-solid fa-spinner fa-spin") " Uploading...")
+        (input :type "file" :id "feature-image-file"
+          :accept "image/jpeg,image/png,image/gif,image/webp,image/svg+xml" :class "hidden"))
+      (input :type "text" :name "title" :value (or title-val "") :placeholder title-placeholder
+        :class "w-full text-[36px] font-bold bg-transparent border-none outline-none placeholder:text-stone-300 mb-[8px] leading-tight")
+      (textarea :name "custom_excerpt" :rows "1" :placeholder "Add an excerpt..."
+        :class "w-full text-[18px] text-stone-500 bg-transparent border-none outline-none placeholder:text-stone-300 resize-none mb-[24px] leading-relaxed"
+        (or excerpt-val ""))
+      ;; Editor tabs
+      (div :class "flex gap-[4px] mb-[8px] border-b border-stone-200"
+        (button :type "button" :id "editor-tab-sx"
+          :class (if has-sx active inactive)
+          :onclick "document.getElementById('sx-editor').style.display='block';document.getElementById('lexical-editor').style.display='none';this.className='px-[12px] py-[6px] text-[13px] font-medium text-stone-700 border-b-2 border-stone-700 cursor-pointer bg-transparent';document.getElementById('editor-tab-koenig').className='px-[12px] py-[6px] text-[13px] font-medium text-stone-400 border-b-2 border-transparent cursor-pointer bg-transparent hover:text-stone-600'"
+          "SX Editor")
+        (button :type "button" :id "editor-tab-koenig"
+          :class (if has-sx inactive active)
+          :onclick "document.getElementById('lexical-editor').style.display='block';document.getElementById('sx-editor').style.display='none';this.className='px-[12px] py-[6px] text-[13px] font-medium text-stone-700 border-b-2 border-stone-700 cursor-pointer bg-transparent';document.getElementById('editor-tab-sx').className='px-[12px] py-[6px] text-[13px] font-medium text-stone-400 border-b-2 border-transparent cursor-pointer bg-transparent hover:text-stone-600'"
+          "Koenig (Legacy)"))
+      (div :id "sx-editor" :class "relative w-full bg-transparent"
+        :style (if has-sx "" "display:none"))
+      (div :id "lexical-editor" :class "relative w-full bg-transparent"
+        :style (if has-sx "display:none" ""))
+      ;; Initial lexical JSON
+      (script :id "lexical-initial-data" :type "application/json" lexical-json)
+      ;; Footer: status + publish mode + newsletter + save + badges
+      (div :class "flex flex-wrap items-center gap-[16px] mt-[32px] pt-[16px] border-t border-stone-200"
+        (select :id "status-select" :name "status" :class sel-cls
+          (option :value "draft" :selected (= status "draft") "Draft")
+          (option :value "published" :selected (= status "published") "Published"))
+        (select :id "publish-mode-select" :name "publish_mode"
+          :class (str sel-cls (if (= status "published") "" " hidden")
+                              (if already-emailed " opacity-50 pointer-events-none" ""))
+          :disabled (if already-emailed true nil)
+          (option :value "web" :selected true "Web only")
+          (option :value "email" "Email only")
+          (option :value "both" "Web + Email"))
+        (select :id "newsletter-select" :name "newsletter_slug"
+          :class (str sel-cls " hidden")
+          :disabled (if already-emailed true nil)
+          newsletter-options)
+        (button :type "submit"
+          :class "px-[20px] py-[6px] bg-stone-700 text-white text-[14px] rounded-[8px] hover:bg-stone-800 transition-colors cursor-pointer"
+          "Save")
+        (when footer-extra footer-extra)))))
+
+;; Publish-mode show/hide script for edit form
+(defcomp ~blog-editor-publish-js (&key already-emailed)
+  (script
+    "(function() {"
+    "  var statusSel = document.getElementById('status-select');"
+    "  var modeSel = document.getElementById('publish-mode-select');"
+    "  var nlSel = document.getElementById('newsletter-select');"
+    (str "  var alreadyEmailed = " (if already-emailed "true" "false") ";")
+    "  function sync() {"
+    "    var isPublished = statusSel.value === 'published';"
+    "    if (isPublished && !alreadyEmailed) { modeSel.classList.remove('hidden'); } else { modeSel.classList.add('hidden'); }"
+    "    var needsEmail = isPublished && !alreadyEmailed && (modeSel.value === 'email' || modeSel.value === 'both');"
+    "    if (needsEmail) { nlSel.classList.remove('hidden'); } else { nlSel.classList.add('hidden'); }"
+    "  }"
+    "  statusSel.addEventListener('change', sync);"
+    "  modeSel.addEventListener('change', sync);"
+    "  sync();"
+    "})();"))
+
 (defcomp ~blog-editor-styles (&key css-href)
   (<> (link :rel "stylesheet" :href css-href)
     (style

blog/sx/sx_components.py

@@ -1271,7 +1271,7 @@ def render_editor_panel(save_error: str | None = None, is_page: bool = False) ->
         "\n"
         "    if (typeof SxEditor !== 'undefined') {\n"
         "      SxEditor.mount('sx-editor', {\n"
-        "        initialSx: window.__SX_INITIAL__ || null,\n"
+        "        initialSx: (document.getElementById('sx-content-input') || {}).value || null,\n"
         "        csrfToken: csrfToken,\n"
         "        uploadUrls: uploadUrls,\n"
         f"        oembedUrl: '{oembed_url}',\n"
@@ -1678,10 +1678,11 @@ def _raw_html_sx(html: str) -> str:
 
 
 def _post_edit_content_sx(ctx: dict) -> str:
-    """Build WYSIWYG editor panel natively (replaces _types/post_edit/_main_panel.html)."""
+    """Build WYSIWYG editor panel as SX expression (edit page)."""
     from quart import url_for as qurl, current_app, g, request as qrequest
     from shared.browser.app.csrf import generate_csrf_token
-    esc = escape
+    from shared.sx.helpers import sx_call
+    from shared.sx.parser import SxExpr
 
     ghost_post = ctx.get("ghost_post", {}) or {}
     save_success = ctx.get("save_success", False)
@@ -1706,181 +1707,81 @@ def _post_edit_content_sx(ctx: dict) -> str:
 
     feature_image = ghost_post.get("feature_image") or ""
     feature_image_caption = ghost_post.get("feature_image_caption") or ""
-    title_val = esc(ghost_post.get("title") or "")
-    excerpt_val = esc(ghost_post.get("custom_excerpt") or "")
-    updated_at = esc(ghost_post.get("updated_at") or "")
+    title_val = ghost_post.get("title") or ""
+    excerpt_val = ghost_post.get("custom_excerpt") or ""
+    updated_at = ghost_post.get("updated_at") or ""
     status = ghost_post.get("status") or "draft"
     lexical_json = ghost_post.get("lexical") or '{"root":{"children":[{"children":[],"direction":null,"format":"","indent":0,"type":"paragraph","version":1}],"direction":null,"format":"","indent":0,"type":"root","version":1}}'
     sx_content = ghost_post.get("sx_content") or ""
+    has_sx = bool(sx_content)
 
     already_emailed = bool(ghost_post and ghost_post.get("email") and (ghost_post["email"] if isinstance(ghost_post["email"], dict) else {}).get("status"))
-    # For ORM objects the email may be an object
     email_obj = ghost_post.get("email")
     if email_obj and not isinstance(email_obj, dict):
         already_emailed = bool(getattr(email_obj, "status", None))
 
-    parts: list[str] = []
-
-    # Error banner
-    if save_error:
-        parts.append(
-            f'<div class="max-w-[768px] mx-auto mt-[16px] rounded-[8px] border border-red-300 bg-red-50 px-[16px] py-[12px] text-[14px] text-red-700">'
-            f'<strong>Save failed:</strong> {esc(save_error)}</div>'
-        )
-
-    # Hidden inputs
-    fi_hidden = f' hidden' if not feature_image else ''
-    fi_visible = f' hidden' if feature_image else ''
-
     title_placeholder = "Page title..." if is_page else "Post title..."
 
-    form_parts: list[str] = []
-    form_parts.append(f'<input type="hidden" name="csrf_token" value="{csrf}">')
-    form_parts.append(f'<input type="hidden" name="updated_at" value="{updated_at}">')
-    form_parts.append('<input type="hidden" id="lexical-json-input" name="lexical" value="">')
-    form_parts.append(f'<input type="hidden" id="sx-content-input" name="sx_content" value="{esc(sx_content)}">')
-    form_parts.append(f'<input type="hidden" id="feature-image-input" name="feature_image" value="{esc(feature_image)}">')
-    form_parts.append(f'<input type="hidden" id="feature-image-caption-input" name="feature_image_caption" value="{esc(feature_image_caption)}">')
-
-    # Feature image section
-    form_parts.append(
-        f'<div id="feature-image-container" class="relative mt-[16px] mb-[24px] group">'
-        f'<div id="feature-image-empty" class="{"hidden" if feature_image else ""}">'
-        f'<button type="button" id="feature-image-add-btn" class="text-[14px] text-stone-400 hover:text-stone-600 transition-colors cursor-pointer">+ Add feature image</button>'
-        f'</div>'
-        f'<div id="feature-image-filled" class="relative {"" if feature_image else "hidden"}">'
-        f'<img id="feature-image-preview" src="{esc(feature_image)}" alt="" class="w-full max-h-[448px] object-cover rounded-[8px] cursor-pointer">'
-        f'<button type="button" id="feature-image-delete-btn" class="absolute top-[8px] right-[8px] w-[32px] h-[32px] rounded-full bg-black/50 text-white flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity hover:bg-black/70 cursor-pointer text-[14px]" title="Remove feature image"><i class="fa-solid fa-trash-can"></i></button>'
-        f'<input type="text" id="feature-image-caption" value="{esc(feature_image_caption)}" placeholder="Add a caption..." class="mt-[8px] w-full text-[14px] text-stone-500 bg-transparent border-none outline-none placeholder:text-stone-300 focus:text-stone-700">'
-        f'</div>'
-        f'<div id="feature-image-uploading" class="hidden flex items-center gap-[8px] mt-[8px] text-[14px] text-stone-400"><i class="fa-solid fa-spinner fa-spin"></i> Uploading...</div>'
-        f'<input type="file" id="feature-image-file" accept="image/jpeg,image/png,image/gif,image/webp,image/svg+xml" class="hidden">'
-        f'</div>'
-    )
-
-    # Title
-    form_parts.append(
-        f'<input type="text" name="title" value="{title_val}" placeholder="{title_placeholder}"'
-        f' class="w-full text-[36px] font-bold bg-transparent border-none outline-none placeholder:text-stone-300 mb-[8px] leading-tight">'
-    )
-
-    # Excerpt
-    form_parts.append(
-        f'<textarea name="custom_excerpt" rows="1" placeholder="Add an excerpt..."'
-        f' class="w-full text-[18px] text-stone-500 bg-transparent border-none outline-none placeholder:text-stone-300 resize-none mb-[24px] leading-relaxed">{excerpt_val}</textarea>'
-    )
-
-    # Editor tabs: SX (primary) and Koenig (legacy)
-    has_sx = bool(sx_content)
-    sx_active = 'text-stone-700 border-b-2 border-stone-700 cursor-pointer bg-transparent'
-    sx_inactive = 'text-stone-400 border-b-2 border-transparent cursor-pointer bg-transparent hover:text-stone-600'
-    form_parts.append(
-        '<div class="flex gap-[4px] mb-[8px] border-b border-stone-200">'
-        f'<button type="button" id="editor-tab-sx" class="px-[12px] py-[6px] text-[13px] font-medium {sx_active if has_sx else sx_inactive}"'
-        """ onclick="document.getElementById('sx-editor').style.display='block';document.getElementById('lexical-editor').style.display='none';this.className='px-[12px] py-[6px] text-[13px] font-medium text-stone-700 border-b-2 border-stone-700 cursor-pointer bg-transparent';document.getElementById('editor-tab-koenig').className='px-[12px] py-[6px] text-[13px] font-medium text-stone-400 border-b-2 border-transparent cursor-pointer bg-transparent hover:text-stone-600'" """
-        '>SX Editor</button>'
-        f'<button type="button" id="editor-tab-koenig" class="px-[12px] py-[6px] text-[13px] font-medium {sx_inactive if has_sx else sx_active}"'
-        """ onclick="document.getElementById('lexical-editor').style.display='block';document.getElementById('sx-editor').style.display='none';this.className='px-[12px] py-[6px] text-[13px] font-medium text-stone-700 border-b-2 border-stone-700 cursor-pointer bg-transparent';document.getElementById('editor-tab-sx').className='px-[12px] py-[6px] text-[13px] font-medium text-stone-400 border-b-2 border-transparent cursor-pointer bg-transparent hover:text-stone-600'" """
-        '>Koenig (Legacy)</button>'
-        '</div>'
-    )
-    # SX editor mount point
-    form_parts.append(f'<div id="sx-editor" class="relative w-full bg-transparent" style="{"" if has_sx else "display:none"}"></div>')
-    # Koenig editor mount point
-    form_parts.append(f'<div id="lexical-editor" class="relative w-full bg-transparent" style="{"display:none" if has_sx else ""}"></div>')
-
-    # Initial lexical JSON
-    form_parts.append(f'<script id="lexical-initial-data" type="application/json">{lexical_json}</script>')
-
-    # Status + publish footer
-    draft_sel = ' selected' if status == 'draft' else ''
-    pub_sel = ' selected' if status == 'published' else ''
-    mode_hidden = ' hidden' if status != 'published' else ''
-    mode_disabled = ' opacity-50 pointer-events-none' if already_emailed else ''
-    mode_dis_attr = ' disabled' if already_emailed else ''
-
-    nl_options = '<option value="">Select newsletter\u2026</option>'
+    # Newsletter options as SX fragment
+    nl_parts = ['(option :value "" "Select newsletter\u2026")']
     for nl in newsletters:
-        nl_slug = esc(getattr(nl, "slug", ""))
-        nl_name = esc(getattr(nl, "name", ""))
-        nl_options += f'<option value="{nl_slug}">{nl_name}</option>'
+        nl_slug = sx_serialize(getattr(nl, "slug", ""))
+        nl_name = sx_serialize(getattr(nl, "name", ""))
+        nl_parts.append(f"(option :value {nl_slug} {nl_name})")
+    nl_opts_sx = SxExpr("(<> " + " ".join(nl_parts) + ")")
 
-    footer_extra = ''
+    # Footer extra badges as SX fragment
+    badge_parts: list[str] = []
     if save_success:
-        footer_extra += ' <span class="text-[14px] text-green-600">Saved.</span>'
+        badge_parts.append('(span :class "text-[14px] text-green-600" "Saved.")')
     publish_requested = qrequest.args.get("publish_requested") if hasattr(qrequest, 'args') else None
     if publish_requested:
-        footer_extra += ' <span class="text-[14px] text-blue-600">Publish requested \u2014 an admin will review.</span>'
+        badge_parts.append('(span :class "text-[14px] text-blue-600" "Publish requested \u2014 an admin will review.")')
     if post.get("publish_requested"):
-        footer_extra += ' <span class="inline-block px-2 py-0.5 rounded-full text-xs font-semibold bg-blue-100 text-blue-800">Publish requested</span>'
+        badge_parts.append('(span :class "inline-block px-2 py-0.5 rounded-full text-xs font-semibold bg-blue-100 text-blue-800" "Publish requested")')
     if already_emailed:
         nl_name = ""
         newsletter = ghost_post.get("newsletter")
         if newsletter:
             nl_name = getattr(newsletter, "name", "") if not isinstance(newsletter, dict) else newsletter.get("name", "")
-        suffix = f" to {esc(nl_name)}" if nl_name else ""
-        footer_extra += f' <span class="inline-block px-2 py-0.5 rounded-full text-xs font-semibold bg-green-100 text-green-800">Emailed{suffix}</span>'
+        suffix = f" to {nl_name}" if nl_name else ""
+        badge_parts.append(f'(span :class "inline-block px-2 py-0.5 rounded-full text-xs font-semibold bg-green-100 text-green-800" "Emailed{suffix}")')
+    footer_extra_sx = SxExpr("(<> " + " ".join(badge_parts) + ")") if badge_parts else None
 
-    form_parts.append(
-        f'<div class="flex flex-wrap items-center gap-[16px] mt-[32px] pt-[16px] border-t border-stone-200">'
-        f'<select id="status-select" name="status" class="text-[14px] rounded-[4px] border border-stone-200 px-[8px] py-[6px] bg-white text-stone-600">'
-        f'<option value="draft"{draft_sel}>Draft</option>'
-        f'<option value="published"{pub_sel}>Published</option></select>'
-        f'<select id="publish-mode-select" name="publish_mode" class="text-[14px] rounded-[4px] border border-stone-200 px-[8px] py-[6px] bg-white text-stone-600{mode_hidden}{mode_disabled}"{mode_dis_attr}>'
-        f'<option value="web" selected>Web only</option><option value="email">Email only</option><option value="both">Web + Email</option></select>'
-        f'<select id="newsletter-select" name="newsletter_slug" class="text-[14px] rounded-[4px] border border-stone-200 px-[8px] py-[6px] bg-white text-stone-600 hidden"{mode_dis_attr}>{nl_options}</select>'
-        f'<button type="submit" class="px-[20px] py-[6px] bg-stone-700 text-white text-[14px] rounded-[8px] hover:bg-stone-800 transition-colors cursor-pointer">Save</button>'
-        f'{footer_extra}</div>'
-    )
+    parts: list[str] = []
 
-    form_html = '<form id="post-edit-form" method="post" class="max-w-[768px] mx-auto pb-[48px]">' + "".join(form_parts) + '</form>'
-    parts.append(form_html)
+    # Error banner
+    if save_error:
+        parts.append(sx_call("blog-editor-error", error=save_error))
 
-    # Publish-mode show/hide JS
-    already_emailed_js = 'true' if already_emailed else 'false'
-    parts.append(
-        '<script>'
-        '(function() {'
-        "  var statusSel = document.getElementById('status-select');"
-        "  var modeSel = document.getElementById('publish-mode-select');"
-        "  var nlSel = document.getElementById('newsletter-select');"
-        f'  var alreadyEmailed = {already_emailed_js};'
-        '  function sync() {'
-        "    var isPublished = statusSel.value === 'published';"
-        "    if (isPublished && !alreadyEmailed) { modeSel.classList.remove('hidden'); } else { modeSel.classList.add('hidden'); }"
-        "    var needsEmail = isPublished && !alreadyEmailed && (modeSel.value === 'email' || modeSel.value === 'both');"
-        "    if (needsEmail) { nlSel.classList.remove('hidden'); } else { nlSel.classList.add('hidden'); }"
-        '  }'
-        "  statusSel.addEventListener('change', sync);"
-        "  modeSel.addEventListener('change', sync);"
-        '  sync();'
-        '})();'
-        '</script>'
-    )
+    # Form (sx_content_val populates #sx-content-input; JS reads from there)
+    parts.append(sx_call("blog-editor-edit-form",
+        csrf=csrf,
+        updated_at=str(updated_at),
+        title_val=title_val,
+        excerpt_val=excerpt_val,
+        feature_image=feature_image,
+        feature_image_caption=feature_image_caption,
+        sx_content_val=sx_content,
+        lexical_json=lexical_json,
+        has_sx=has_sx,
+        title_placeholder=title_placeholder,
+        status=status,
+        already_emailed=already_emailed,
+        newsletter_options=nl_opts_sx,
+        footer_extra=footer_extra_sx,
+    ))
 
-    # Editor CSS + styles + SX editor styles
-    from shared.sx.helpers import sx_call
-    parts.append(f'<link rel="stylesheet" href="{esc(editor_css)}">')
+    # Publish-mode JS
+    parts.append(sx_call("blog-editor-publish-js", already_emailed=already_emailed))
+
+    # Editor CSS + styles
+    parts.append(sx_call("blog-editor-styles", css_href=editor_css))
     parts.append(sx_call("sx-editor-styles"))
-    parts.append(
-        '<style>'
-        '#lexical-editor { display: flow-root; }'
-        '#lexical-editor [data-kg-card="html"] * { float: none !important; }'
-        '#lexical-editor [data-kg-card="html"] table { width: 100% !important; }'
-        '</style>'
-    )
 
-    # Initial sx content for SX editor
-    sx_initial_escaped = sx_content.replace('\\', '\\\\').replace("'", "\\'").replace('\n', '\\n').replace('\r', '')
-    parts.append(f"<script>window.__SX_INITIAL__ = '{sx_initial_escaped}' || null;</script>")
-
-    # Editor JS + SX editor JS + init
-    parts.append(f'<script src="{esc(editor_js)}"></script>')
-    parts.append(f'<script src="{esc(sx_editor_js)}"></script>')
-    parts.append(
-        '<script>'
+    # Editor JS + init
+    init_js = (
         '(function() {'
-        # Font size overrides for Koenig
         "  function applyEditorFontSize() {"
         "    document.documentElement.style.fontSize = '62.5%';"
         "    document.body.style.fontSize = '1.6rem';"
@@ -1956,7 +1857,7 @@ def _post_edit_content_sx(ctx: dict) -> str:
         '    });'
         "    if (typeof SxEditor !== 'undefined') {"
         "      SxEditor.mount('sx-editor', {"
-        "        initialSx: window.__SX_INITIAL__ || null,"
+        "        initialSx: (document.getElementById('sx-content-input') || {}).value || null,"
         '        csrfToken: csrfToken,'
         '        uploadUrls: uploadUrls,'
         f"        oembedUrl: '{oembed_url}',"
@@ -1976,10 +1877,13 @@ def _post_edit_content_sx(ctx: dict) -> str:
         "    if (typeof window.mountEditor === 'function') { clearInterval(_t); init(); }"
         '  }, 50); }'
         '})();'
-        '</script>'
     )
+    parts.append(sx_call("blog-editor-scripts",
+                         js_src=editor_js,
+                         sx_editor_js_src=sx_editor_js,
+                         init_js=init_js))
 
-    return _raw_html_sx("".join(parts))
+    return "(<> " + " ".join(parts) + ")"
 
 
 # ===========================================================================

shared/static/scripts/sx-editor.js

@@ -2249,7 +2249,9 @@
       return null;
     }
 
-    root.className = (root.className || "") + " sx-editor";
+    // Clear any previous mount
+    root.innerHTML = "";
+    root.className = (root.className || "").replace(/\bsx-editor\b/g, "").trim() + " sx-editor";
 
     var container = el("div", { className: "sx-blocks-container" });
     root.appendChild(container);

shared/static/scripts/sx.js

@@ -76,7 +76,7 @@
 
   var RE_WS = /\s+/y;
   var RE_COMMENT = /;[^\n]*/y;
-  var RE_STRING = /"(?:[^"\\]|\\.)*"/y;
+  var RE_STRING = /"(?:[^"\\]|\\[\s\S])*"/y;
   var RE_NUMBER = /-?(?:\d+\.?\d*|\.\d+)(?:[eE][+-]?\d+)?/y;
   var RE_KEYWORD = /:[a-zA-Z_][a-zA-Z0-9_>:\-]*/y;
   var RE_SYMBOL = /[a-zA-Z_~*+\-><=/!?&][a-zA-Z0-9_~*+\-><=/!?.:&]*/y;

shared/sx/helpers.py

@@ -254,7 +254,7 @@ def search_desktop_sx(ctx: dict) -> str:
     )
 
 
-def post_header_sx(ctx: dict, *, oob: bool = False) -> str:
+def post_header_sx(ctx: dict, *, oob: bool = False, child: str = "") -> str:
     """Build the post-level header row as sx call string."""
     post = ctx.get("post") or {}
     slug = post.get("slug", "")
@@ -273,6 +273,7 @@ def post_header_sx(ctx: dict, *, oob: bool = False) -> str:
         link_label_content=SxExpr(label_sx),
         nav=SxExpr(nav_sx) if nav_sx else None,
         child_id="post-header-child",
+        child=SxExpr(child) if child else None,
         oob=oob, external=True,
     )
 
@@ -378,6 +379,7 @@ def sx_call(component_name: str, **kwargs: Any) -> str:
     return "(" + " ".join(parts) + ")"
 
 
+
 def components_for_request() -> str:
     """Return defcomp/defmacro source for definitions the client doesn't have yet.
 

shared/sx/layouts.py

@@ -104,16 +104,18 @@ def _post_full(ctx: dict, **kw: Any) -> str:
 
 def _post_oob(ctx: dict, **kw: Any) -> str:
     post_hdr = post_header_sx(ctx, oob=True)
-    return post_hdr
+    # Also replace #post-header-child (empty — clears any nested admin rows)
+    child_oob = oob_header_sx("post-header-child", "", "")
+    return "(<> " + post_hdr + " " + child_oob + ")"
 
 
 def _post_admin_full(ctx: dict, **kw: Any) -> str:
     slug = ctx.get("post", {}).get("slug", "")
     selected = kw.get("selected", "")
     root_hdr = root_header_sx(ctx)
-    post_hdr = post_header_sx(ctx)
     admin_hdr = post_admin_header_sx(ctx, slug, selected=selected)
-    return "(<> " + root_hdr + " " + post_hdr + " " + admin_hdr + ")"
+    post_hdr = post_header_sx(ctx, child=admin_hdr)
+    return "(<> " + root_hdr + " " + post_hdr + ")"
 
 
 def _post_admin_oob(ctx: dict, **kw: Any) -> str: