IMHO every desktop environment (yes, looking at you, macOS) should aggressively block focus stealing. The only conditions under which focus should change:
- I've just launched the application
- I've clicked on a window
- I've clicked the window's icon in the dock
- I've cmd-tabbed (or equivalent) to this window
- The currently focused window has produced a modal dialog, that prevents all input events from going into the original window. (Whether and when modal dialogs are OK is debatable.)
- I've just launched the application
- I've clicked on a window
- I've clicked the window's icon in the dock
- I've cmd-tabbed (or equivalent) to this window
- The currently focused window has produced a modal dialog, that prevents all input events from going into the original window. (Whether and when modal dialogs are OK is debatable.)
Matthew 5:37, "anything more comes from evil".