fixde: editor breaking when clicking vim button

frontend/src/components/react/admin/Editor.tsx

@@ -1,6 +1,6 @@
 import { useState, useEffect, useRef, useCallback } from 'react';
 import { EditorView, keymap, placeholder as cmPlaceholder } from '@codemirror/view';
-import { EditorState } from '@codemirror/state';
+import { EditorState, Compartment } from '@codemirror/state';
 import { markdown, markdownLanguage } from '@codemirror/lang-markdown';
 import { languages } from '@codemirror/language-data';
 import { defaultKeymap, indentWithTab } from '@codemirror/commands';
@@ -18,7 +18,6 @@ interface Props {
   editSlug?: string;
 }
 
-// CodeMirror theme matching the Catppuccin narlblog style
 const narlblogTheme = EditorView.theme({
   '&': {
     backgroundColor: 'var(--crust)',
@@ -42,7 +41,6 @@ const narlblogTheme = EditorView.theme({
     border: 'none',
   },
   '.cm-activeLineGutter': { backgroundColor: 'var(--surface0)' },
-  // Search panel styling
   '.cm-panels': {
     backgroundColor: 'var(--mantle)',
     color: 'var(--text)',
@@ -50,7 +48,6 @@ const narlblogTheme = EditorView.theme({
   },
   '.cm-searchMatch': { backgroundColor: 'var(--yellow)', opacity: '0.3' },
   '.cm-searchMatch-selected': { backgroundColor: 'var(--peach)', opacity: '0.4' },
-  // Vim cursor styling
   '.cm-fat-cursor': {
     backgroundColor: 'var(--mauve) !important',
     color: 'var(--crust) !important',
@@ -98,6 +95,9 @@ function renderMathInElement(element: HTMLElement) {
   for (let i = 0; i < 3; i++) walk(element);
 }
 
+// Compartment for hot-swapping vim mode without recreating the editor
+const vimCompartment = new Compartment();
+
 export default function Editor({ editSlug }: Props) {
   const editorRef = useRef<HTMLDivElement>(null);
   const viewRef = useRef<EditorView | null>(null);
@@ -131,7 +131,6 @@ export default function Editor({ editSlug }: Props) {
     } else {
       result.then(h => { if (previewRef.current) previewRef.current.innerHTML = h; });
     }
-    // Enhance preview after render
     requestAnimationFrame(() => {
       if (!previewRef.current) return;
       renderMathInElement(previewRef.current);
@@ -141,9 +140,14 @@ export default function Editor({ editSlug }: Props) {
     });
   }, [showPreview]);
 
-  function buildExtensions() {
+  // Initialize CodeMirror once
-    const exts = [
+  useEffect(() => {
-      ...(vimEnabled ? [vim()] : []),
+    if (!editorRef.current || viewRef.current) return;
+
+    const state = EditorState.create({
+      doc: '',
+      extensions: [
+        vimCompartment.of(window.innerWidth > 768 ? vim() : []),
         keymap.of([...defaultKeymap, ...searchKeymap, indentWithTab]),
         search(),
         closeBrackets(),
@@ -153,10 +157,8 @@ export default function Editor({ editSlug }: Props) {
         cmPlaceholder('# Hello World\nWrite your markdown here...'),
         EditorView.updateListener.of(update => {
           if (!update.docChanged) return;
-        // Debounced preview update
           if (previewTimerRef.current) clearTimeout(previewTimerRef.current);
           previewTimerRef.current = setTimeout(updatePreview, 300);
-        // Autocomplete trigger
           const pos = update.state.selection.main.head;
           const line = update.state.doc.lineAt(pos);
           const textBefore = line.text.slice(0, pos - line.from);
@@ -167,26 +169,21 @@ export default function Editor({ editSlug }: Props) {
             setShowAutocomplete(false);
           }
         }),
-    ];
+      ],
-    return exts;
-  }
-
-  // Initialize / rebuild CodeMirror when vim mode toggles
-  useEffect(() => {
-    if (!editorRef.current) return;
-
-    // Preserve content if rebuilding
-    const oldContent = viewRef.current?.state.doc.toString() || '';
-    if (viewRef.current) viewRef.current.destroy();
-
-    const state = EditorState.create({
-      doc: oldContent,
-      extensions: buildExtensions(),
     });
+
     const view = new EditorView({ state, parent: editorRef.current });
     viewRef.current = view;
 
     return () => { view.destroy(); viewRef.current = null; };
+  }, []);
+
+  // Hot-swap vim mode via compartment reconfiguration
+  useEffect(() => {
+    if (!viewRef.current) return;
+    viewRef.current.dispatch({
+      effects: vimCompartment.reconfigure(vimEnabled ? vim() : []),
+    });
   }, [vimEnabled]);
 
   // Load existing post for editing
@@ -202,7 +199,6 @@ export default function Editor({ editSlug }: Props) {
     }).catch(() => showAlertMsg('Failed to load post.', 'error'));
   }, [editSlug]);
 
-  // Update preview when toggled on
   useEffect(() => {
     if (showPreview) updatePreview();
   }, [showPreview, updatePreview]);
@@ -389,10 +385,10 @@ export default function Editor({ editSlug }: Props) {
           </div>
         </div>
 
-        {/* Editor + Preview */}
+        {/* Editor + Preview — both columns stretch to the taller one */}
-        <div className={`relative ${showPreview ? 'grid grid-cols-1 md:grid-cols-2 gap-4' : ''}`}>
+        <div className={`relative ${showPreview ? 'grid grid-cols-1 md:grid-cols-2 gap-4 items-stretch' : ''}`}>
-          <div className="relative">
+          <div className="relative min-h-[500px]" style={showPreview ? { display: 'flex', flexDirection: 'column' } : undefined}>
-            <div ref={editorRef} className="min-h-[500px]" />
+            <div ref={editorRef} style={showPreview ? { flex: '1 1 0', minHeight: 0 } : undefined} className={showPreview ? '' : 'min-h-[500px]'} />
 
             {/* Autocomplete dropdown */}
             {showAutocomplete && autocompleteAssets.length > 0 && (
@@ -427,13 +423,13 @@ export default function Editor({ editSlug }: Props) {
             )}
           </div>
 
-          {/* Live Preview */}
+          {/* Live Preview — stretches to match editor height */}
           {showPreview && (
-            <div className="border border-surface1 rounded-xl bg-crust/50 overflow-y-auto max-h-[600px] min-h-[500px]">
+            <div className="border border-surface1 rounded-xl bg-crust/50 overflow-y-auto flex flex-col min-h-[500px]">
               <div className="sticky top-0 bg-mantle px-4 py-2 text-xs text-subtext0 uppercase border-b border-surface1 z-10">
                 Preview
               </div>
-              <div ref={previewRef} className="prose max-w-none p-4 md:p-6" />
+              <div ref={previewRef} className="prose max-w-none p-4 md:p-6 flex-1" />
             </div>
           )}
         </div>

frontend/src/pages/posts/[slug].astro

@@ -73,7 +73,7 @@ const isAdmin = Astro.cookies.has('admin_token');
           </div>
         </header>
         <div id="post-content" class="prose max-w-none" set:html={html} />
-        <PostEnhancer client:load containerId="post-content" />
+        <PostEnhancer client:only="react" containerId="post-content" />
       </>
     )}
   </article>