diff --git a/frontend/js/viewer.js b/frontend/js/viewer.js
index 197334e..2aef5ca 100644
--- a/frontend/js/viewer.js
+++ b/frontend/js/viewer.js
@@ -652,21 +652,33 @@ export function renderFile(data) {
   });
 
   // Action buttons
+  // Cache local au rendu courant: state.cachedRawSource global est fiable
+  // uniquement quand openFile() initialise le fichier (il le réinitialise).
+  // Or le contenu d'un onglet peut être rendu via renderFile() direct sans
+  // passer par openFile() — un cache partagé transporterait le contenu du
+  // fichier précédent (bug pretty print sur fichiers successifs).
+  let localRaw = null;
+  const getRaw = async () => {
+    if (localRaw != null) return localRaw;
+    if (state.currentVault === data.vault && state.currentPath === data.path && state.cachedRawSource) {
+      localRaw = state.cachedRawSource;
+      return localRaw;
+    }
+    const rawUrl = `/api/file/${encodeURIComponent(data.vault)}/raw?path=${encodeURIComponent(data.path)}`;
+    const rawData = await api(rawUrl);
+    localRaw = rawData.raw;
+    return localRaw;
+  };
   const copyBtn = el("button", { class: "btn-action", title: "Copier la source" }, [icon("copy", 14), document.createTextNode("Copier")]);
   copyBtn.addEventListener("click", async () => {
     try {
-      // Fetch raw content if not already cached
-      if (!state.cachedRawSource) {
-        const rawUrl = `/api/file/${encodeURIComponent(data.vault)}/raw?path=${encodeURIComponent(data.path)}`;
-        const rawData = await api(rawUrl);
-        state.cachedRawSource = rawData.raw;
-      }
+      const rawSrc = await getRaw();
       if (navigator.clipboard) {
-        await navigator.clipboard.writeText(state.cachedRawSource);
+        await navigator.clipboard.writeText(rawSrc);
       } else {
         // Fallback for non-secure contexts
         const ta = document.createElement("textarea");
-        ta.value = state.cachedRawSource;
+        ta.value = rawSrc;
         ta.style.position = "fixed"; ta.style.opacity = "0";
         document.body.appendChild(ta); ta.select();
         document.execCommand("copy");
@@ -832,12 +844,7 @@ export function renderFile(data) {
     state.showingSource = !state.showingSource;
     if (state.showingSource) {
       sourceBtn.classList.add("active");
-      if (!state.cachedRawSource) {
-        const rawUrl = `/api/file/${encodeURIComponent(data.vault)}/raw?path=${encodeURIComponent(data.path)}`;
-        const rawData = await api(rawUrl);
-        state.cachedRawSource = rawData.raw;
-      }
-      raw.textContent = state.cachedRawSource;
+      raw.textContent = await getRaw();
       rendered.style.display = "none";
       raw.style.display = "block";
     } else {
@@ -856,18 +863,15 @@ export function renderFile(data) {
     prettyBtn.addEventListener("click", async () => {
       const on = !prettyBtn.classList.contains("active");
       if (on) {
+        let rawText = "";
         try {
-          if (!state.cachedRawSource) {
-            const rawUrl = `/api/file/${encodeURIComponent(data.vault)}/raw?path=${encodeURIComponent(data.path)}`;
-            const rawData = await api(rawUrl);
-            state.cachedRawSource = rawData.raw;
-          }
+          rawText = await getRaw();
         } catch (_) {
-          state.cachedRawSource = mdDiv.textContent || "";
+          rawText = mdDiv.textContent || "";
         }
-        mdDiv.innerHTML = buildPrettyHtml(data, state.cachedRawSource);
+        mdDiv.innerHTML = buildPrettyHtml(data, rawText);
         const codeEl = mdDiv.querySelector("code");
-        applyPrettyHighlight(codeEl, detectPrettyLang(data), state.cachedRawSource);
+        applyPrettyHighlight(codeEl, detectPrettyLang(data), rawText);
         prettyBtn.classList.add("active");
       } else {
         mdDiv.innerHTML = data.html;