Save Page As

Adds Save Page As… to the File menu, above Print, with a shortcut. It saves the page you're on, as Chrome does, which Dia only offers in the page's right-click menu.

Turn it on

Open Dia → Settings → Patches and switch on Save Page As. Or run:

diatweaks enable savePageAs

Change the shortcut

It's ⌥⌘S to begin with, because ⌘S shows and hides the sidebar. Under the switch, click Shortcut and press the keys you want. It needs ⌘, ⌃ or ⌥, unless it's a function key. Press Delete to clear it, or Escape to keep the one you had.