When editing a page, if too much time has passed perhaps, when I try to update, I get a blank page with "Are you sure you want to do this? Please try again." Whether I click "Please try again" or click the back button, I've lost all changes in the edit window. How about a pop-up window that doesn't prevent me from copying text in the edit window? Then I can copy my changes before losing the page.
I try to remember to copy my changes before I update, but sometimes I forget. This has to be an easy change to make, I would think.
It certainly would be a considerate thing to do.