fix: pinned md preview bypassed by force=true callers and reload

Block all _loadPreview calls when md viewer is pinned (even force=true)
since previewDetails would be for the current editor file, not the
pinned file. Handle reload button separately: use resendContent() to
re-send the pinned document without clearing cache (reloadCurrentFile
clears the cache expecting a re-send that never comes when pinned).
Guard _openLivePreviewURL and _activeDocChanged to prevent LP iframe
from replacing the pinned md viewer.

Author: abose

src/extensionsIntegrated/Phoenix-live-preview/MarkdownSync.js

@@ -1023,6 +1023,14 @@ define(function (require, exports, module) {
         }, "*");
     }
 
+    /**
+     * Re-send the current document's content to the iframe without clearing cache.
+     * Used when pinned to refresh the preview without losing the cached DOM.
+     */
+    function resendContent() {
+        _sendContent();
+    }
+
     /**
      * Set a callback for when the iframe requests edit mode.
      * The callback should check entitlements and approve/deny.
@@ -1073,6 +1081,7 @@ define(function (require, exports, module) {
     exports.deactivate = deactivate;
     exports.isActive = isActive;
     exports.reloadCurrentFile = reloadCurrentFile;
+    exports.resendContent = resendContent;
     exports.setEditModeRequestHandler = setEditModeRequestHandler;
     exports.setEditMode = setEditMode;
     exports.setIframeReadyHandler = setIframeReadyHandler;

src/extensionsIntegrated/Phoenix-live-preview/main.js

@@ -847,6 +847,12 @@ define(function (require, exports, module) {
         $pinUrlBtn.click(_togglePinUrl);
         $livePreviewPopBtn.click(_popoutLivePreview);
         $reloadBtn.click(()=>{
+            if (_isMdviewrActive && urlPinned) {
+                // When pinned, just re-send the pinned document's content
+                MarkdownSync.resendContent();
+                Metrics.countEvent(Metrics.EVENT_TYPE.LIVE_PREVIEW, "reloadBtn", "click");
+                return;
+            }
             if (_isMdviewrActive) {
                 MarkdownSync.reloadCurrentFile();
             }
@@ -876,8 +882,7 @@ define(function (require, exports, module) {
         _setTitle(relativeOrFullPath, currentPreviewFile, "");
 
         if (_isMdviewrActive) {
-            if (urlPinned && !force) {
-                // Pinned — don't switch the md viewer content
+            if (urlPinned) {
                 return;
             }
             // Mdviewr iframe already loaded, just update the sync for the new document
@@ -930,6 +935,12 @@ define(function (require, exports, module) {
         if(urlPinned && !force) {
             return;
         }
+        // When md viewer is pinned, block ALL preview loads — the previewDetails
+        // would be for the current editor file, not the pinned file
+        if(urlPinned && _isMdviewrActive) {
+            return;
+        }
+
         // Use mdviewr for markdown files (unless custom server is configured)
         if(previewDetails.isMarkdownFile && !previewDetails.isCustomServer && !previewDetails.isNoPreview) {
             _loadMdviewrPreview(previewDetails, force);
@@ -1205,6 +1216,9 @@ define(function (require, exports, module) {
             _hideOverlay();
             return;
         }
+        if (_isMdviewrActive && urlPinned) {
+            return;
+        }
         _loadPreview(true);
         const currentPreviewDetails = await StaticServer.getPreviewDetails();
         if(currentPreviewDetails.isHTMLFile && currentPreviewDetails.fullPath !== previewDetails.fullPath){