Strips .ipynb suffix from tab title

Author: JasonWeill

packages/application-extension/src/index.ts

@@ -55,6 +55,11 @@ const EDITOR_FACTORY = 'Editor';
  */
 const TREE_PATTERN = new RegExp('/(notebooks|edit)/(.*)');
 
+/**
+ * A regular expression to suppress the file extension from display for .ipynb files.
+ */
+const STRIP_IPYNB = /\.ipynb$/;
+
 /**
  * The command IDs used by the application plugin.
  */
@@ -383,15 +388,16 @@ const tabTitle: JupyterFrontEndPlugin<void> = {
           const title =
             current.sessionContext.path || current.sessionContext.name;
           const basename = PathExt.basename(title);
-          document.title = basename;
+          // Strip the ".ipynb" suffix from filenames for display in tab titles.
+          document.title = basename.replace(STRIP_IPYNB, '');
         };
         current.sessionContext.sessionChanged.connect(update);
         update();
         return;
       } else if (current instanceof DocumentWidget) {
         const update = () => {
           const basename = PathExt.basename(current.context.path);
-          document.title = basename;
+          document.title = basename.replace(STRIP_IPYNB, '');
         };
         current.context.pathChanged.connect(update);
         update();
@@ -434,11 +440,8 @@ const title: JupyterFrontEndPlugin<void> = {
         return;
       }
 
-      // Don't show the file extension for .ipynb files.
-      const stripIpynb = /\.ipynb$/;
-
       const h = document.createElement('h1');
-      h.textContent = current.title.label.replace(stripIpynb, '');
+      h.textContent = current.title.label.replace(STRIP_IPYNB, '');
       widget.node.appendChild(h);
       widget.node.style.marginLeft = '10px';
       if (!docManager) {
@@ -472,7 +475,7 @@ const title: JupyterFrontEndPlugin<void> = {
           const newPath = current.context.path ?? result.path;
           const basename = PathExt.basename(newPath);
 
-          h.textContent = basename.replace(stripIpynb, '');
+          h.textContent = basename.replace(STRIP_IPYNB, '');
           if (!router) {
             return;
           }