Mu4e: have =mu4e replace an empty workspace

modules/email/mu4e/autoload/email.el

@@ -55,6 +55,11 @@ default/fallback account."
   (interactive)
   (require 'mu4e)
   (if (featurep! :ui workspaces)
+      ;; delete current workspace if empty
+      ;; this is useful when mu4e is in the daemon
+      ;; as otherwise you can accumulate empty workspaces
+      (unless (+workspace-buffer-list)
+        (+workspace-delete (+workspace-current-name)))
     (+workspace-switch +mu4e-workspace-name t)
     (setq +mu4e--old-wconf (current-window-configuration))
     (delete-other-windows)