"Do you want to save changes?" dialog

[morsisko]

Well that's not big deal nor really important task, however I find it useful from interface point of view to add the dialog like "Do you want to save changes?" when you press "X" in the main form and you have unsaved changes. Programs like text, image, video or music editors (and so on) use this feature. I know that you can just press CTRL+S, however sometimes it is possible to accidentally close the window, without confidence what the last saved file contains.