No prompt to save changes when closing application.

[XV-02]

This might be dependent on other outstanding work, but at current (3d4fa84), there is no form of dialogue or prevention to stop cosmic-editor from being closed while unsaved changes are present in documents. This is true when closing using the button in the upper-right, by quitting from the file menu, or if using the close button on the application tab when using stacked windows.

[WatchMkr]

It does work if trying to close a tab with a modified document.