CompilerExplorer: Fix undo

Fixes context handling for the Editor. This allows Undo/Redo actions to
activate correctly.

Change-Id: Ieb7fa27215f5746cf5f26e8e7b3b74f44023481c
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/compilerexplorer/compilerexplorerplugin.cpp

@@ -38,7 +38,7 @@ public:
 
         auto action = new QAction(Tr::tr("Open Compiler Explorer"), this);
         connect(action, &QAction::triggered, this, [] {
-            QString name("Compiler Explorer");
+            QString name("Compiler Explorer $");
             Core::EditorManager::openEditorWithContents(Constants::CE_EDITOR_ID,
                                                         &name,
                                                         settings().defaultDocument().toUtf8());