When an image is opened from Nautilus, thus starting the the standard image viewer, EOG, this window does not has the immediate focus. A user has to click into the window to move the focus to EOG.
This problem is especially cumbersome when EOG is opened maximized: a user can not see that the global menu which is unhidden when moving the mouse to the title bar, is *not* the menu of EOG (it is the menu of Nautilus...). When trying to close EOG, a user *actually* closes the former window (= Nautilus). Because the user see nothing changing (because a hidden window underneath is closed), he clicks another time and only then, the EOG window is closing. The user expects to come back to Nautilus, but he will not find it.
When an image is opened from Nautilus, thus starting the the standard image viewer, EOG, this window does not has the immediate focus. A user has to click into the window to move the focus to EOG.
This problem is especially cumbersome when EOG is opened maximized: a user can not see that the global menu which is unhidden when moving the mouse to the title bar, is *not* the menu of EOG (it is the menu of Nautilus...). When trying to close EOG, a user *actually* closes the former window (= Nautilus). Because the user see nothing changing (because a hidden window underneath is closed), he clicks another time and only then, the EOG window is closing. The user expects to come back to Nautilus, but he will not find it.
I don't have to explain how confusing this is.