Editor - Need a notice that leaving the page may discard your work

[RobMackie]

If you are editing a file and you change contexts by clicking on another "icon" for an app or mode of fabmo, all of your work may disappear. Need a notice as you try to leave the page that says that you may lose your work - cancel or proceed. and each editor context needs an easy way to "cancel" and then save and then move to other context.

[tedh-shopbot]

Also note that if you are editing a file, just a refresh will cause the loss of the edited file and switch the editor to working on the current "editor workpad" contents. The suggested warning might go a long way to making users happy with the editor.