On the other hand, after opening a bunch of tool windows and documents to copy-paste between in photoshop or blender or whatever, users don’t expect a ‘back but

On the other hand, after opening a bunch of tool windows and documents to copy-paste between in photoshop or blender or whatever, users don’t expect a ‘back button’ to take them back to the previous window layout state. They might expect a back button to navigate among which window is in the foreground, or between view/zoom positions. Consider the possibility that some web applications might actually benefit from acting more like that.